The proportion of oxygen in our atmosphere today
A) has increased to 20% since before photosynthesis.
B) has remained about the same since the first organisms developed.
C) has decreased to 10%, from higher levels before photosynthesis.
D) increased rapidly since the development of water-splitting photosynthesis and eukaryotes.
E) has increased to 20%, including rapid increase since water-splitting photosynthesis and eukaryotes.
Correct Answer:
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A) not an oxidation-reduction reaction.
B) an
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