Over geologic time, _____ open up vast areas of shallow seas that could be inhabited and exploited.
A) marine transgressions over the cratons
B) marine regressions from the cratons
C) glaciations
D) continental movements
E) mass extinctions
Correct Answer:
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Q17: The Precambrian-Cambrian boundary represents the first appearance
Q18: One of the most significant roles of
Q19: Fusulinids, greatly diversified in the Pennsylvanian and
Q20: Hox genes _.
A)control the formation of shells
B)control
Q21: The 360-million-year-old Acanthostega _.
A)had limbs but could
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
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