The earliest photosynthesizers likely used ____ as electron donors.

Name: The earliest photosynthesizers likely used ____ as electron donors.
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The earliest photosynthesizers are thought to have used hydrogen sulfide (H2S) as an electron donor in the process of photosynthesis, particularly in environments where oxygen was scarce or absent. This is evidenced by the existence of modern-day bacteria that still use H2S in a similar manner.

The Earliest Photosynthesizers Likely Used ____ as Electron Donors