Fins composed of a web of skin covering thin, bony spines are characteristic of:
A) lobe-finned fishes.
B) ray-finned fishes.
C) hagfishes.
D) lampreys.
E) cartilaginous fishes.
Correct Answer:
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Q33: Lampreys have reduced the size of commercial
Q34: A shark is a(n):
A)bony fish.
B)cartilaginous fish.
C)jawless fish.
D)amphibian.
E)invertebrate
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.
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
Q43: The high body temperature of birds and
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