The early Earth's reducing atmosphere probably contained all of the following except
A) carbon dioxide.
B) water.
C) oxygen.
D) hydrogen sulfide.
Correct Answer:
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Q2: Two principal organelles in eukaryotes that were
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Q8: The oldest microfossils are of
A)prokaryotes.
B)eukaryotes.
C)insects.
D)pollen grains.
Q9: Which of the following was produced in
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Q15: Which one of the following statements about
Q16: True multicellularity is a major characteristic of
A)all
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