Chapter 16-Mammals Flashcards Preview

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Flashcards in Chapter 16-Mammals Deck (102)
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31

What is the inner layer of the primary germ layers where the cells in it specialize to become the digestive tract, respiratory tract, urinary bladder, and urethra?

Endoderm

32

During the embryos growth, it is surrounded by a fluid called the _______________. Thus fluid absorbs the shocks that are created when the mother runs or is bumped by an object?

Amniotic fluid

33

When the embryo is later in its development, when it is recognized as a young individual, it is called a:

Fetus

34

The entire period of growth from fertilization to birth is called the:

Gestation period

35

What is connects the fetus to the placenta that will be cut by the mother, freeing the newborn from the mother?

Umbilical cord

36

Mammals that bear their young Alvie and nourish them during development are called:

Viviparous

37

What kind of mammals do not bear their young alive?

Oviparous

38

What are the three major categories of mammals based on the way the developing young are nourished?

Placental mammals
Egg-laying mammals
Pouched mammals

39

What are the largest living land animals, and are the mammals with trunks?

Elephants

40

What are the enlarged incisor teeth of elephants, made of ivory?

Tusks

41

What are the dugongs and manatees often called because they graze like it, and can be seen in shallow waters of tropical rivers, lagoons, and sea coasts?

"Sea cows"

42

The echidna and duckbill platypus are the only ____________ in existence.

Oviparous (egg-laying)

43

What is the slowest land mammal, with a usual speed of 6 to 8 feet per minute?

Ai

44

What term refers to an animal that is active during the daytime?

Diurnal

45

What is the term that refers to animals that are active at night?

Nocturnal

46

What us pouched mammal referred to as:

Marsupials

47

What are the young marsupials raised in?

Marsupium

48

What is the largest living marsupial?

Kangaroo

49

What term refers to an animal that eats insects?

Insectivorous

50

What is one order of small mammals that gets its name from the insect-eating habits of its members?

Insectivorous

51

The smallest mammal is believed to be the:

Pygmy shrew

52

What are some examples of the pouched mammals?

Kangaroos,
Opossums,
Wombats,
Koalas,
Numbats

53

What are some examples of the insect-eating mammals?

Shrews,
Hedgehogs,
Moles

54

What is an example of the flying mammals, that spend longer periods of uninterrupted hibernation than any other mammal?

Bats

55

What are the two main categories of marine mammals?

Baleen whales,
Toothed whales

56

What kind of whales have two rows of comblike plates that hang like curtains from each side of the upper jaw?

Baleen whales

57

What is the world's largest animal, that may attain a length of 110 feet and a weight of more than 150 tons?

Blue whale

58

What kind of whales include such marine animals as sperm whales, killer whales, dolphins, and porpoises, and can be up to 65 feet long?

Toothed whales

59

The sperm whale's huge head contains a large amount of a waxy substance known as _________________, that was once used as a lamp oil, as a lubricant, and as a base for cosmetics.

Spermaceti

60

The sperm whale's intestinal tract produces a grayish, waxy material known as _______________ that is often found floating in tropical seas and was once used to make perfumes.

Ambergris