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
Answer:B
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