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Photosynthesis Probably Originated During the ________ Eon and Most Likely

Question 56

Multiple Choice

Photosynthesis probably originated during the ________ eon and most likely used ________ as an electron donor.

A) Proterozoic; water
B) Archean; water
C) Archean; hydrogen sulfide
D) Proterozoic; hydrogen sulfide
E) Paleozoic; water

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