The O2 in the atmosphere
A) was present since the earth was formed.
B) was emitted by volcanoes.
C) is the result of sunlight decomposing water vapor.
D) was produced by photosynthesis.
Correct Answer:
Verified
Q21: The theory of evolution is supported by
Q22: Evolution in living things
A)stopped at the end
Q22: At one time during the Paleozoic era
A)all
Q22: The theory of evolution is credited to
A)
Q28: The correct sequence of geologic time divisions
Q29: Paleozoic rocks are noteworthy for the presence
Q30: Which one of the following is not
Q30: Arrange the following animals in the order
Q31: Evidence suggests that large-scale biological extinctions may
Q33: Flowering plants first appeared in the
A) Cenozoic
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