The high body temperature of birds and mammals is due to:
A) their high metabolic rates.
B) the presence of sweat, scent, and sebaceous glands.
C) the fur that insulates them.
D) behaviors like basking in the sun and seeking shade.
E) the exchange of gases and nutrients via the placenta.
Correct Answer:
Verified
Q38: Fins composed of a web of skin
Q39: Cartilaginous fishes are characterized by:
A)bony skeletons.
B)four-chambered hearts.
C)lungs
Q40: Cartilaginous fishes differ from lampreys because they:
A)lack
Q41: Why do amphibians need a moist environment?
A)The
Q42: Which characteristic do birds share with mammals?
A)a
Q44: An animal that has a four-chambered heart,
Q45: Why are reptiles better adapted to land
Q46: Birds belong to a related group of
Q47: A tadpole is a(n):
A)bony fish.
B)cartilaginous fish.
C)jawless fish.
D)amphibian.
E)invertebrate
Q48: Why don't reptilian embryos dry out in
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