Flashcards in Ch. 24 Practice Deck (24)
What is the current human population of the Earth?
A bit over 7 billion
______ ______ is the maximum population that a particular environment can support for an indefinite period.
Weakens trees and makes them more susceptible to disease and insects
Increase in ocean temperatures due to global warming
Loss of coral reefs, potential loss of coastal wetlands
Limits crop and tree growth, and kills plankton that sustain ocean life
Contamination by human-made organic compounds
Interruption of hormone function in some animals
Birthrates and death rates for human populations are usually reported as rates per ______ people.
What metals are dangerous to human health?
The heavy metals, including lead, mercury, arsenic, cadmium, tin, chromium, zinc, and copper
Any undesired alteration of the environment, often caused by human activities, is known as ______.
Fossil fuels are derived from:
Remains of plants and animals that died millions of years ago
In what ways does biodiversity within ecosystems support biogeochemical cycles?
• Removal of carbon dioxide from the atmosphere
• Uptake of excess soil nitrogen
• Provision of phosphate
• Provision of freshwater
The maximum population growth rate under ideal conditions is called a population's ______ potential.
______ can be described in terms of numbers of different species.
In what ways do exotic species get introduced to new ecosystems?
• Accidental transport
Chemicals that treat cancer have been obtained from the ______ of Madagascar.
A type of mining in which land is removed to reach a mineral is called ______ mining.
What benefits are provided by coastal wetlands?
• Areas for fish spawning
• Bird habitats
• Protection from storms
Fossil fuels and minerals are examples of ______ resources.
In ______, species are hunted, harvested, or collected to the point that their populations decline dramatically.
Forests stabilize the climate because thet take up excess ______.
Over the past 50 years or so, world food production has increased largely due to
Modern farming methods
Two ways that water can be conserved in agriculture relates directly to planting ______ tolerant and ______ tolerant crops.
Greenhouse gases are contributing to an increase in global temperature because they trap ______ in Earth's atmosphere.