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All organisms require energy, carbon, and a source of electrons. While you are likely familiar with the patterns exhibited by multicellular plants and animals, much greater diversity exists among the prokaryotes. The first photoautotrophs to evolve did not produce oxygen. What does this most strongly suggest about them?

Respuesta :

Answer:

This suggests that the electron donor is not water

Explanation:

In photoautotrophs that produce oxygen, water is the electron donor in electronic chain: H2O dissociates in ½ O2 + 2H+ + 2e-, thereby oxygen is produced (superior plants, cyanobacteria, algae).

In some primitive prokaryotes, other molecule is used instead of water as electron donor: H2S and sulfur is generated.

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