The crossopterygians were well-adapted to move onto the land because they had ____.
A) lungs, but not necessarily a means for locomotion
B) a means for locomotion, but not necessarily lungs
C) cartilaginous skeletons
D) lungs and a means of locomotion
E) webbed feet
Correct Answer:
Verified
Q23: What characteristic did the earliest fish have?
A)armored
Q24: The vast epeiric sea of the Middle
Q25: What feature distinguishes the two subclasses of
Q26: At the end of the Paleozoic era,
Q27: The earliest fish were _.
A)ray-finned
B)boney-finned
C)cartilaginous
D)jawless
E)jawed
Q29: Why do most experts agree that the
Q30: The ancestors and early members of the
Q31: What does the name Placoderm mean?
A)plate-skinned
B)bony skin
C)scaly
Q32: The mass extinction at the end of
Q33: What is the correct order of trophic
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