chapter 5

Question 1

What will likely happen to deciduous northeastern forests, that currently supply most of our maple syrup, in response to climate change?

Multiple choice question.

The timing and amount of sap will be less reliable.

Warmer temperatures will generate thicker soils that support more seedlings.

The sugar maples will disappear.

Answer 1

The timing and amount of sap will be less reliable.

Question 2

An ecological community with distinct temperature and precipitation patterns is called a(n) ____.

Answer 2

biome

Question 2

The environments that cover two-thirds of earth’s surface and thus have a large influence on our climate and are the source of much of our food, are _____ environments.

Answer 2

ocean, marine, or saltwater

Question 3

What two characteristics are the most important in determining the distribution of a biome?

Multiple choice question.

Temperature and precipitation

Altitude and precipitation

Biological productivity and ecosystem resilience

Latitude and longitude

Answer 3

Temperature and precipitation

Question 4

Tropical moist forests all have abundant moisture and uniform _____.

Answer 4

temperatures

Question 5

The maple syrup industry that exists in the deciduous forest of Quebec and the northeastern U.S. will Blank______ as climate changes.

Multiple choice question.

benefit

suffer

Answer 5

suffer

Question 6

Select the statement below that accurately describes nutrient cycling in a tropical moist forest.

Multiple choice question.

Nutrients recycle quickly and living organisms contain about 90% of the nutrients in the system.

Nutrient recycling generally does not occur in tropical moist forests as the frequent rains wash the nutrients away.

Nutrients recycle slowly and the majority of nutrients are locked up in the deep rich soil.

Answer 6

Nutrients recycle quickly and living organisms contain about 90% of the nutrients in the system.

Question 7

Which of the following is the best definition for the term biome?

Multiple choice question.

A place where organisms live

Species with similar characteristics that live on different continents

A human-made habitat where everything is recycled and sustainable

Environments that have similar climate, growth patterns, and vegetation

Answer 7

Environments that have similar climate, growth patterns, and vegetation

Question 8

Why is it difficult to restore tropical moist forests once they have been removed?

Multiple choice question.

The chemicals used to clear rainforests prevent the growth of new plants.

The plants and animals will migrate to protected rainforests and will be unwilling to return.

The local albedo changes, reducing the amount of available sunlight.

Since 90 percent of the nutrients in a tropical moist forest are above its soil, the thin soil alone cannot support a rainforest’s regrowth.

Answer 8

Since 90 percent of the nutrients in a tropical moist forest are above its soil, the thin soil alone cannot support a rainforest’s regrowth.

Question 8

Biomes are differentiated by temperature and precipitation. Which of the following answers correctly ranks the biomes from high to low precipitation and high to low temperature?

Multiple choice question.

Tropical rainforest, boreal forest, tundra

Tropical rainforest, desert, savanna

Tropical rainforest, tundra, savanna

Tundra, grasslands, desert

Answer 8

Tropical rainforest, boreal forest, tundra

Question 9

A graph that displays the plot of precipitation and temperature variation over a year for a given location is called a Blank______.

Multiple choice question.

pycnocline

weathergraph

thermocline

climograph

Answer 9

climograph

Question 10

Ocean environments cover two-thirds of the earth’s surface and thus are important for that reason alone. Why else are marine environments important?

Multiple select question.

They provide the mass needed to keep the planet revolving about its axis.

They provide much of our food.

The chemicals needed to form DNA are found only in seafood.

They regulate our climate through photosynthesis and other processes.

Answer 10

They provide much of our food.

They regulate our climate through photosynthesis and other processes.

Question 11

Common attributes of tropical moist forests include ample Blank______ and uniform Blank______.

Multiple choice question.

rainfall; temperatures

sunlight; elevation

vegetation; topography

cloud cover; altitude

Answer 11

rainfall; temperatures

Question 12

A community with drought-tolerant forest species, hot temperatures year-round, and low precipitation for most of the year except for periodic rain to support tree growth describes the Blank______ biome.

Multiple choice question.

desert

tundra

tropical seasonal forest

tropical savanna

Answer 12

tropical seasonal forest

Question 13

Which of the following is most likely to occur when plant and other organic matter falls to the floor of a tropical moist forest?

Multiple choice question.

It is recycled quickly and incorporated into the living biomass.

It is removed from the forest floor via transpiration and becomes part of the local atmosphere.

It decays slowly via inorganic processes and is added to the soil.

It is preserved in the rock as coal.

Answer 13

It is recycled quickly and incorporated into the living biomass.

Question 14

A grassland receives too little rain to support a forest. If the grassland starts to get enough rain to support a sparse tree cover, the grassland may transition into a Blank______ over time.

Multiple choice question.

taiga

desert

wet forest

savanna

Answer 14

savanna

Question 15

The thin, nutrient-poor soils found in tropical moist forests Blank______.

Multiple select question.

are difficult to damage by modern forest clear-cutting techniques

cannot support long-term agricultural production

are easily eroded when the forests are removed

allow plant life to be quickly restored after the forest is cut

Answer 15

cannot support long-term agricultural production

are easily eroded when the forests are removed

Question 16

The biome that is defined by unpredictable and low (under 30 cm per year) precipitation rates is the ______ biome.

Answer 16

desert

Question 17

What information is displayed on a climograph for a given location?

Multiple choice question.

The long-term average of the temperature and precipitation for each month

The yearly temperature average for each year there is a modern temperature record

The biodiversity of an area and the relative biological productivity for each month of the year

The long-term average atmospheric pressure and relative humidity for each month

Answer 17

The long-term average of the temperature and precipitation for each month

Question 18

Which of the following characteristics allow plants to survive in the desert?

Multiple select question.

Salt tolerance

Deep roots

Thick epidermal layers

No production of flowers

Water-storing capacity

Answer 18

Salt tolerance

Thick epidermal layers

Water-storing capacity

Question 19

Which of the following is not a characteristic of a tropical seasonal forest?

Multiple choice question.

Drought-tolerant plant species

Dry year-round

Periodic rainfall

Vividly green during rainy months

Answer 19

Dry year-round

Question 20

Identify conditions that are associated with limited rainfall, and hence, desert biomes.

Multiple select question.

Extremely cold air

Warm, dry, high-pressure systems

A location in a continental interior

A location on the ocean (windward) side of a large mountain.

Answer 20

Extremely cold air

Warm, dry, high-pressure systems

A location in a continental interior

Question 21

The controlling factor in determining where grasslands will occur as a terrestrial biome is the Blank______.

Multiple choice question.

yearly variation in temperature in the region

concentration of carbon dioxide in the atmosphere above the region

absence of soil nitrogen in the region

amount of rain the region receives

Answer 21

amount of rain the region receives

Question 22

What is the difference between grasslands and savannas?

Multiple choice question.

Savannas have sand dunes in addition to the grass-covered areas.

The grasses in savannas are not present year-round; they only grow after the rainy season and die shortly after.

Savannas have a sparse tree cover in addition to the grass-covered areas.

Savannas and grasslands are the same, but the term savanna is used in the Southern Hemisphere instead of grasslands.

Answer 22

Savannas have a sparse tree cover in addition to the grass-covered areas.

Question 23

An area known for hot, dry summers and cool, moist winters would most likely be a Blank______ biome. Multiple choice question. desert temperate deciduous forest tundra temperate shrubland

Answer 23

temperate shrubland

Question 24

Deserts occur where Blank______. Multiple choice question. the daily temperature variations exceed 38οC during the winter months steady low-pressure systems occur year-round precipitation is rare and unpredictable with usually less than 30 cm of rain per year more than half of an area is covered by sand

Answer 24

precipitation is rare and unpredictable with usually less than 30 cm of rain per year

Question 25

Temperate forests tend to occur most often at Blank______ latitudes. Multiple choice question. high low middle

Answer 25

middle

Question 26

Deserts are abundant near 30ο north and south latitudes because Blank______. Multiple choice question. the polar jets bring dry polar air to these latitudes warm, high-pressure systems exist there moist air rises quickly into the atmosphere there little of earth's surface is covered by water at that latitude

Answer 26

warm, high-pressure systems exist there

Question 26

Because precipitation is rare and unpredictable in deserts, many plants there are ____-deciduous.

Answer 26

drought

Question 27

Under what conditions do grasslands occur? They occur where Blank______. Multiple choice question. there is enough rain to support abundant grass but not enough for forests the elevation is too high for trees but too low for bushes there is enough rain to support trees but steady winds prevent them from pollinating one another

Answer 27

there is enough rain to support abundant grass but not enough for forests

Question 28

Match the correct tree type to the best description. Deciduous trees Coniferous trees

Answer 28

Deciduous trees: Trees that lose their leaves seasonally Coniferous trees: Trees that are cone-bearing

Question 29

Which of the following characteristics produce a temperate shrubland? Multiple select question. Hot season coincides with a dry season Cool temperatures all year Cool, moist winters Consistent precipitation all year Heavy rainfall in summer

Answer 29

Hot season coincides with a dry season Cool, moist winters

Question 30

Which of the following describe coniferous forests? Multiple select question. Leaves are thick and wide. Tress are primarily deciduous. The soils are sandy. Moisture can be scarce due to cold temperatures or seasonal drought. They support forestry in many areas.

Answer 30

The soils are sandy. Moisture can be scarce due to cold temperatures or seasonal drought. They support forestry in many areas.

Question 31

Choose the two latitudes that best defines where temperate forests are located (between which two.) Multiple select question. 10° 30° 55° 90°

Answer 31

30° 55°

Question 32

The giant California redwoods occur in locations that receive abundant rainfall and have mild temperatures year-round. These locations are Blank______. Multiple choice question. Muir environments temperate rainforests coastal timberlands fog forests

Answer 32

temperate rainforests

Question 33

Which of the following characteristics allow plants to survive in the desert? Multiple select question. Water-storing capacity Salt tolerance Thick epidermal layers Deep roots No production of flowers

Answer 33

Water-storing capacity Salt tolerance Thick epidermal layers

Question 34

A taiga is Blank______. Multiple choice question. a grassland mixed with swamps in the southern regions of Asia and Central Europe a forest that occurs at extremely high latitudes or altitudes. They have high growth rates because they tend to receive abundant sunlight the ragged edge of the boreal forest where it gives way to open tundra. Extreme cold and short summers lead to slow growth rates here a desert-like environment that develops in the horse latitudes on islands in the Pacific Ocean

Answer 34

the ragged edge of the boreal forest where it gives way to open tundra. Extreme cold and short summers lead to slow growth rates here

Question 35

Deciduous temperate forests tend to occupy climates that are Blank______ than climates where there are coniferous temperature forests. Multiple choice question. moister and more moderate in temperature drier and hotter drier and colder moister and hotter

Answer 35

moister and more moderate in temperature

Question 36

Select the best definition for the term tundra. Multiple choice question. A deciduous forest region with ample summer rainfall A treeless landscape occurring at high latitudes A barren land with no plants because of a lack of water A forest dense with trees in a cold climate

Answer 36

A treeless landscape occurring at high latitudes

Question 37

Trees in temperate ____ forests have thin, waxy leaves that help reduce moisture loss, as this biome commonly is located in areas with limited moisture.

Answer 37

coniferous or evergreen

Question 38

What characteristics are associated with temperate rainforests? Multiple select question. They receive abundant rain. Foggy conditions are common. They are often located in rain shadows. California redwoods can be found in them. They are extremely warm year-round.

Answer 38

They receive abundant rain. Foggy conditions are common. California redwoods can be found in them.

Question 39

In Russia, a boreal forest often mixes with open tundra to create what is known as the Blank______. Multiple choice question. Black Forest dark forest taiga Kopeck

Answer 39

taiga

Question 40

The tundra has a growing season of only Blank______ months and can experience Blank______ at any time of the year. Multiple choice question. four to six; snow six to seven; rain two to three; frost five to seven; wind

Answer 40

two to three; frost

Question 41

What organisms form the base of the marine ecosystem? Multiple choice question. Sardines Corals Phytoplankton Zooplankton

Answer 41

Phytoplankton

Question 42

Select the characteristics that contribute to vertical stratification in aquatic ecosystems. Multiple select question. Temperature increases with depth. Temperature decreases with depth. Light increases with depth. Light decreases with depth.

Answer 42

Temperature decreases with depth. Light decreases with depth.

Question 43

How is marine productivity best described in the open ocean? Multiple choice question. It is best described as a barren wasteland because no life exits there. It can be described as a biological desert because of the low productivity. It is best described as the equivalent of a temperate forest because of the year-round modest levels of production. It is best compared to a rainforest because of the high biological productivity.

Answer 43

It can be described as a biological desert because of the low productivity.

Question 44

Locations in the ocean where excess nutrients support rapid bacterial growth and a resulting removal of dissolved oxygen from the waters are called ____ zones.

Answer 44

dead

Question 45

Which of the following organisms have a symbiotic relationship and work together to form living reefs? Multiple choice question. Fish, eels, and marine plankton Plants and fungi Echinoderms and chemosynthetic autotrophs Colonial animals (coral polyps) and photosynthetic algae

Answer 45

Colonial animals (coral polyps) and photosynthetic algae

Question 46

Why are phytoplankton a key part of the marine ecosystem? Multiple choice question. They remove the 18O isotope from seawater allowing marine animals to flourish. They provide the needed salts to form saltwater. They shield deep water organisms from harmful UV radiation. They form the base of the marine food web.

Answer 46

They form the base of the marine food web.

Question 47

What is the greatest threat to coral reefs? Multiple choice question. Increased density of algal mats that block sunlight Introduction of invasive exotic fish species Unsustainable forestry practices that increase sediment runoff Global warming, which causes coral bleaching

Answer 47

Global warming, which causes coral bleaching

Question 48

Vertical stratification occurs in aquatic ecosystems due to decreasing ____ and ____ with depth.

Answer 48

light or sunlight temperature or temperatures

Question 49

Because of the lack of nutrients, biological productivity is often low in Blank______. Multiple choice question. the open ocean upwelling zones near-shore environments equatorial regions

Answer 49

the open ocean

Question 50

Coral bleaching occurs when Blank______. Multiple choice question. elevated water temperatures cause corals to expel their symbiotic algal partners decreased levels of pH (increased acidity) in the ocean causes calcium carbonate to precipitate on coral reefs the corals are infected by genetically engineered bacteria accidentally released into the ocean during a shipwreck in 1993 ships release hydrogen peroxide as they clean their bilge pumps and it bleaches nearby corals

Answer 50

elevated water temperatures cause corals to expel their symbiotic algal partners

Question 51

What are the causes of "dead zones" in the ocean? They occur where Blank______. Multiple choice question. decomposers and detritivores are more abundant than the primary producers in a region surface waters freeze and form sea ice nutrients are limited in the ocean and marine productivity drops below adjacent regions nutrients are overly abundant and bacterial growth and decay consume almost all of the dissolved oxygen from the water

Answer 51

nutrients are overly abundant and bacterial growth and decay consume almost all of the dissolved oxygen from the water

Question 52

What type of tropical trees grow in salt water and act as both shoreline stabilizers and nurseries for many aquatic species?

Answer 52

mangroves

Question 53

True or false: Coral reefs are formed by plants.

Answer 53

False

Question 54

Match the correct items to the related mangrove habitat threats. Loss of natural nursery grounds for fish and shrimp Clear-cutting of mangrove forests for fish farms Removal for timber

Answer 54

Loss of natural nursery grounds for fish and shrimp: Ecosystem threat Clear-cutting of mangrove forests for fish farms: Aquaculture threat Removal for timber: Commercial threat

Question 55

Which of the following are threats to the rich, diverse communities found in coral reef biomes? Multiple select question. Introduced pathogens and predators Shallow waters that can support coral species Establishment of marine reserves Destructive fishing methods Excess nutrient runoff from land Trash and sewage

Answer 55

Introduced pathogens and predators Destructive fishing methods Excess nutrient runoff from land Trash and sewage

Question 56

Identify characteristics of tide pools. Multiple select question. They last about 14 days at a time, as the sands they are formed in are resifted during the next spring tide. They are devoid of all multicellular life. They experience extreme conditions as they are flooded with cold ocean water at high tide and hit with desiccating sunshine at low tide. They occur in rocky shorelines.

Answer 56

They experience extreme conditions as they are flooded with cold ocean water at high tide and hit with desiccating sunshine at low tide. They occur in rocky shorelines.

Question 57

What are barrier islands? They are Blank______. Multiple choice question. low, narrow, sandy islands that form parallel to a coastline offshore islands which prevent a continent from being moved any farther by plate tectonics any islands that are visible from the shores of the mainland on a clear day human-made objects that are used to trap sediment (sand) along a coastline

Answer 57

low, narrow, sandy islands that form parallel to a coastline

Question 58

When corals are stressed by increasing ocean water temperatures they often expel their algal symbionts. This process is called coral Blank______. Multiple choice question. apoptosis bleaching staining disorder

Answer 58

bleaching

Question 59

Select the human activities that destroy barrier islands. Multiple select question. Daily wave-driven erosion Creating roads that cut through dunes Walking on dune grass Wind erosion

Answer 59

Creating roads that cut through dunes Walking on dune grass

Question 60

Which of the following are true with regards to mangroves? Multiple select question. They grow in salt water. Their forests serve as critical nursery grounds for many crustaceans and fish. They help to stabilize shorelines. They grow in both low and high latitudes.

Answer 60

They grow in salt water. Their forests serve as critical nursery grounds for many crustaceans and fish. They help to stabilize shorelines.

Question 60

Identify reasons that correctly explain why tropical coastal mangroves have been cleared. Multiple select question. They have been converted to alpine forests in an effort to save an endangered owl. Mangroves have been removed in an effort to slow coastal erosion. They have been cut down for firewood. They have been cleared to make room for shrimp and fish ponds.

Answer 60

They have been cut down for firewood. They have been cleared to make room for shrimp and fish ponds.

Question 61

What are tide pools? Multiple choice question. Depressions in sandy beaches that fill with water as groundwater seeps into them during low tide Deep grooves in barrier islands that allow tidal waters to flow in and out of backwater areas Areas in the coastal ocean where incoming water from the tides and outgoing freshwater creates semi-permanent eddies Depressions in rocky shorelines that are flooded with water at high tide and retain some of the water at low tide

Answer 61

Depressions in rocky shorelines that are flooded with water at high tide and retain some of the water at low tide

Question 62

The low, narrow, sandy islands that form parallel to a coastline and that are supplied by a steady source of sediment from the nearby continental shelf and river outlets are called _____ _____.

Answer 62

barrier islands

Question 63

What do you observe in the image that could lead to the destruction or degradation of the barrier island? Multiple choice question. The sea level is rising and that will cover the barrier island, leading to its destruction. The road, cutting through the dunes in the foreground of the image, is making the dunes less resistant to erosion. The current heavy wave activity is moving sand out to sea.

Answer 63

The road, cutting through the dunes in the foreground of the image, is making the dunes less resistant to erosion.

Question 64

Why are freshwater ecosystems biologically important? Multiple select question. Most terrestrial species rely on them for survival. They are linked to the ocean system. They support high levels of biodiversity. They are the source of most nutrients on land.

Answer 64

Most terrestrial species rely on them for survival. They support high levels of biodiversity.

Question 65

In the benthos region of a freshwater ecosystem, oxygen levels are Blank______ and Blank______ live in the sediments. Multiple choice question. high; plankton low; emergent vegetation low; anaerobic bacteria high; fish

Answer 65

low; anaerobic bacteria

Question 66

Which of the following correctly identifies the vertically stratified layers of a lake in order, with the shallowest layer at the top and the deepest layer at the bottom? Multiple choice question. Epilimnion, thermocline, hypolimnion Hypolimnion, epilimnion, thermocline Thermocline, epilimnion, hypolimnion

Answer 66

Epilimnion, thermocline, hypolimnion

Question 67

Bacteria that live in anoxic or low-oxygen conditions in marine sediments are Blank______ bacteria. Multiple choice question. aerobic anaerobic halophilic oligotrophic

Answer 67

anaerobic

Question 68

True or false: Water currents, the composition of the bottom (muddy, sandy, or rocky floor), and the degree of connections to other ecosystems tend not to affect the aquatic communities of any particular body of water.

Answer 68

false

Question 69

In Arizona, most birds gather in trees and bushes surrounding the few available rivers and streams. This behavior shows that Blank______. Multiple choice question. the birds need to migrate to locations where more water is available the birds have not adapted to the desert conditions freshwater ecosystems are important to the survival of some terrestrial species

Answer 69

freshwater ecosystems are important to the survival of some terrestrial species

Question 70

Wetlands are shallow ecosystems in which the land surface is submerged in water Blank______. Multiple choice question. at least part of the year year-round only during neap tides

Answer 70

at least part of the year

Question 70

Match the location to the type of freshwater community that would exist there. Water column Air-water interface Benthos Littoral zone

Answer 70

Water column: plankton Air-water interface: mosquitoes Benthos: snails Littoral zone: cattails

Question 71

The thermocline of a lake is the Blank______. Multiple choice question. bacterial community that thrives in the colder but oxygen-rich deep waters area of warmer water that develops in the center of a lake as it is heated by the sun zone of rapid temperature change between the warmer epilimnion layer above and the colder hypolimnion layer below zone of warm water that forms a ring around a lake in the shallow areas

Answer 71

zone of rapid temperature change between the warmer epilimnion layer above and the colder hypolimnion layer below

Question 72

Which of the following statements correctly describe the "value" of wetlands to the United States? Multiple choice question. They have value to the organisms living in them but they seem not to be important on a larger scale. Surprisingly, researchers have determined they provide no real value and we would be better off without them. They perform ecological services, such as floodwater storage, that have been valued in the billions of dollars annually. They have an aesthetic value but no real economic value.

Answer 72

They perform ecological services, such as floodwater storage, that have been valued in the billions of dollars annually.

Question 73

What characteristic defines anaerobic bacteria? Multiple choice question. They do not require a substrate and can live suspended in the air. They require oxygen (O2). They do not use oxygen (O2). They produce oxygen as a waste gas.

Answer 73

They do not use oxygen (O2).

Question 74

Identify the statements below that accurately describe the different types of wetlands. Multiple select question. Fens are just like bogs except that they are supplied with water via an open connection to the ocean. Swamps, which have no trees, tend to not attract waterfowl or shorebirds. Bogs are known for their deep layers of accumulated, undecayed vegetation. Bogs and fens generally have lower productivity than swamps and marshes.

Answer 74

Bogs are known for their deep layers of accumulated, undecayed vegetation. Bogs and fens generally have lower productivity than swamps and marshes.

Question 75

dentify characteristics that affect the local conditions in an aquatic community. Multiple select question. Availability of nutrients Water temperature Stable isotope ratios Local variations in earth's gravity Water depth

Answer 75

Availability of nutrients Water temperature Water depth

Question 76

Select the statement below that best explains why wetlands tend to have high productivity and biodiversity. Multiple choice question. Species that have been pushed out of other biomes due to human occupation have taken refuge in wetlands, thus increasing species diversity there. Wetlands are stable features over geological time scales (millions of years), allowing the species diversity and productivity to grow over time. Wetlands' abundant water, sunlight, and nutrient levels support high levels of primary productivity and support a large, diverse community.

Answer 76

Wetlands' abundant water, sunlight, and nutrient levels support high levels of primary productivity and support a large, diverse community.

Question 77

Vegetated land surfaces which are saturated or submerged in water for at least part of the year are called Blank______. Multiple choice question. fjords brackish wetlands estuaries

Answer 77

wetlands

Question 78

Identify the reasons below that correctly indicate why wetlands are important. Multiple select question. They retain stormwater and reduce flooding. They filter and purify water. Roughly one-third of all endangered species spend at least part of their lives in wetlands. Their weight slows the rate of tectonic plate motion and thus they reduce earthquake risk.

Answer 78

They retain stormwater and reduce flooding. They filter and purify water. Roughly one-third of all endangered species spend at least part of their lives in wetlands.

Question 79

Match the type of wetland to its description. swamps marshes bogs fens

Answer 79

swamps: Wetlands with trees marshes: Wetlands without trees bogs: Areas of saturated ground and with deep layers of peat with water sourced mainly from precipitation fens: Areas of saturated ground sourced mostly by mineral-rich groundwater and covered by specially adapted plants

Question 80

Wetlands have Blank______ diversity and productivity because sunlight can easily penetrate and warm the shallow water conditions to boost photosynthetic activities. Multiple choice question. low moderate high

Answer 80

high

Question 81

Match the biome to the primary reason it is vulnerable to human activity. grasslands: temperate forests: temperate shrublands:

Answer 81

grasslands: high productivity temperate forests: highly habitable temperate shrublands: rare

Question 82

Why are temperate broadleaf forests the most completely human-dominated major biome? Multiple choice question. Temperate forest trees are the easiest by far to cut down, thus temperate forests are the most easily cleared. Temperate broadleaf forests develop under conditions that are also ideal for human occupation, thus they are cleared for that purpose. The trees of the temperate broadleaf forest are the slowest growing, thus taking too long to recover from any disturbance.

Answer 82

Temperate broadleaf forests develop under conditions that are also ideal for human occupation, thus they are cleared for that purpose.

Question 83

Migratory birds have suffered due to the loss of ____ across the world because they have been drained and filled in for other land uses. The area covered by these ecosystems is half what it was 100 years ago in the U.S.

Answer 83

wetlands

Question 84

The biomes listed here are particularly vulnerable to human activity. Which one is so because its high productivity makes it economically valuable? Multiple choice question. Estuary Temperate forest Temperate shrubland

Answer 84

Estuary

Question 85

What is the main reason grasslands are one of the most disturbed biomes? Multiple choice question. Grasslands are easily burned. The coal beds found in the soils of grasslands are highly prized for their high energy output. The lack of other predators make grasslands ideal for human occupation. Grasslands tend to make good farmland.

Answer 85

Grasslands tend to make good farmland.