The earliest organisms were completely heterotrophic in nature. Why?
A. The primitive atmosphere lacked sunlight. Primitive organisms did not have a system complex enough to use for other sources for photosynthesis.
B. The primitive atmosphere lacked oxygen. Primitive organisms did not have a way to break down the oxygen in water.
C. The primitive atmosphere lacked carbon dioxide. Primitive organisms did not have a way to obtain carbon dioxide for photosynthesis.
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