Which of the following is essential for birds to maintain their high metabolic rate?
A) Hollow bones, which decrease body mass
B) Extraordinary coordination by a well-developed nervous system
C) Embryonic development in a shelled amniotic egg
D) Skin that is used as a respiratory structure
E) A four-chambered heart, which maximizes oxygen delivery
Correct Answer:
Verified
Q50: Why have reptiles successfully adapted to land?
A)
Q51: An animal that has a four-chambered heart,
Q52: Although they are mammals, monotremes lack
A) ovaries
Q53: One adaptation that enables an animal to
Q54: Which characteristic do birds share with mammals?
A)
Q56: A marsupial is a(n)
A) amphibian.
B) bird.
C) mammal.
D)
Q57: A tadpole is a(n)
A) amphibian.
B) cartilaginous fish.
C)
Q58: Why are reptiles better adapted to land
Q59: Why do amphibians need a moist environment?
A)
Q60: The high body temperature of birds and
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