Photosynthesis probably originated during the __________ eon,and most likely used _____________ as an electron donor.

Question

Quizplus · Accepted Answer

Photosynthesis is believed to have originated during the Archean eon, which was approximately 3.5 to 2.5 billion years ago. The most likely electron donor during this time period was hydrogen sulfide, as there was little to no oxygen in the atmosphere. This type of photosynthesis is known as anoxygenic photosynthesis.

Photosynthesis Probably Originated During the __________ Eon,and Most Likely Used