Photosynthesis Was a Major Evolutionary Milestone Because

Photosynthesis was a major evolutionary milestone because

A) photosynthetic organisms contributed oxygen to the environment, which led to the evolution of aerobic organisms.
B) photosynthesis led to conditions that allowed unicellular organisms to thrive in marine environments.
C) photosynthesis is the only metabolic process that can convert the chemical energy stored in chemical bonds into biological work.
D) photosynthesis reduces the harmful effects of ultraviolet light.
E) photosynthetic organisms provided a way for the elements carbon, oxygen, and hydrogen to be recycled from the biosphere back into the physical environment.

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