The skeletons of rays and skates are made of:
A) muscle.
B) bone.
C) cartilage.
D) chitin.
E) protein slime.
Correct Answer:
Verified
Q30: Why have populations of many ray-finned fish
Q31: A(n)_ protects the internal organs of ray-finned
Q32: Which vertebrate group is the most diverse?
A)Actinopterygii
B)Actinistia
C)Chondrichthyes
D)Mammalia
E)Reptilia
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
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
Q40: Cartilaginous fishes differ from lampreys because they:
A)lack
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