How did photosynthesis evolve?
It is not as though photosynthesis is a tangential capability or a minor event in the history of life. As the leading science writer Charles Q. Choi put it, “One of the most pivotal moments in Earth’s history was the evolution of the photosynthetic life that suffused air with the oxygen on which virtually all complex life on the planet now depends.”
Photosynthesis is incredibly complex. The molecular machines and their exquisite, finely-tuned, functions are truly amazing.
- JazSincLv 74 years ago
That's a very good question, and if I could give you ten points for asking it, I would.
I don't know the answer.
From the beginning of life to oxygenic photosynthesis was (probably) less than 300 million years. There were repeated cycles in which oxygen trashed the iron environment in the oceans.