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The Earliest Photosynthetic Microbes, Before the Cyanobacterial Lineage Developed, Oxidized

Question 17

Multiple Choice

The earliest photosynthetic microbes, before the cyanobacterial lineage developed, oxidized substances other than water. What was produced by these microbes instead of oxygen?


A) nitrate
B) elemental sulfur
C) ferrous iron
D) hydrogen sulfide

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