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8 April, 21:39

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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  1. 8 April, 21:51
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    The answer to your question would be "B" because the other answers wouldnt be liable answers
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