Several Students Were Talking About Which Came First in the History

Several students were talking about which came first in the history of the Earth.Which student has the best understanding of what happened?

A) Photosynthetic producers must have come first to provide food for other organisms.
B) Anaerobic bacteria must have come first because there was no carbon dioxide in the atmosphere.
C) Photosynthetic producers must have come first to provide oxygen for other organisms.
D) Anaerobic organisms must have come first because there was no oxygen in the atmosphere.

Correct Answer:

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