Cartilaginous fishes differ from lampreys because they:
A) lack a skull.
B) lack a skeleton.
C) have jaws.
D) are ectotherms.
E) have a three-chambered heart.
Correct Answer:
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Q35: The skeletons of rays and skates are
Q36: A lamprey is a(n):
A)bony fish.
B)cartilaginous fish.
C)jawless fish.
D)amphibian.
E)invertebrate
Q37: Chondrichthyes includes:
A)whales.
B)lampreys.
C)all fishes.
D)frogs.
E)sharks.
Q38: Fins composed of a web of skin
Q39: Cartilaginous fishes are characterized by:
A)bony skeletons.
B)four-chambered hearts.
C)lungs
Q41: Why do amphibians need a moist environment?
A)The
Q42: Which characteristic do birds share with mammals?
A)a
Q43: The high body temperature of birds and
Q44: An animal that has a four-chambered heart,
Q45: Why are reptiles better adapted to land
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