Photosynthesis Was a Major Evolutionary Milestone for Several Reasons

Photosynthesis was a major evolutionary milestone for several reasons.One reason is that

A) photosynthetic organisms contributed ozone to the environment, which led to the evolution of aerobic organisms.
B) photosynthesis led to conditions that allowed life to arise on land.
C) photosynthesis is the only metabolic process that consumes oxygen.
D) photosynthesis provides oxygen for anaerobic organisms.
E) photosynthesis changed the levels of carbon dioxide in Earth's atmosphere.

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