What feature distinguishes the two subclasses of bony fish?
A) gill structure
B) skeletal structure
C) fin structure
D) teeth structure
E) scale structure
Correct Answer:
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Q20: Hox genes _.
A)control the formation of shells
B)control
Q21: The 360-million-year-old Acanthostega _.
A)had limbs but could
Q22: Over geologic time, _ open up vast
Q23: What characteristic did the earliest fish have?
A)armored
Q24: The vast epeiric sea of the Middle
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
Q28: The crossopterygians were well-adapted to move onto
Q29: Why do most experts agree that the
Q30: The ancestors and early members of the
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