What was a major waste product of photosynthesis before the cyanobacterial lineage developed on Earth?
A) hydrogen sulfide
B) elemental sulfur
C) carbon monoxide
D) ferrous iron

Question

Quizplus · Accepted Answer

Before the cyanobacterial lineage developed, photosynthetic organisms used hydrogen sulfide as an electron donor, producing elemental sulfur as a waste product.

What Was a Major Waste Product of Photosynthesis Before the Cyanobacterial