Which of the Following Is a Major Evolutionary Step That

question 27

Multiple Choice

Which of the following is a major evolutionary step that is hypothesized to have occurred in the evolution of photosynthesis?

• A)the acquisition by cyanobacteria of a second photosystem.
• B)the ability to use water as an electron donor
• C)the acquisition by eukaryotic organisms of photosynthesis by endosymbiosis
• D)All three of these steps are hypothesized to have been important in the evolution of photosynthesis.

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