Multiple Choice
Over geologic time, the concentration of O2 in Earth's atmosphere has increased.However, at the end of the _______ period, the O2 concentration decreased significantly and was associated with _______.
A) Devonian; rapid evolution of lineages
B) Carboniferous; mass extinctions
C) Permian; mass extinctions
D) Cretaceous; rapid evolution of lineages
E) Cretaceous; mass extinctions
Correct Answer:
Verified
Correct Answer:
Verified
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