What is the predominant hypothesis to explain why animals only appeared in the fossil record about 3 billion years after life originated?
A) There were animals 3 billion years ago, they just weren't fossilized.
B) Animals are warm-blooded, and the ocean was too cold for animals to evolve 3 billion years ago.
C) Animals large enough to be recorded in the fossil record could not evolve until oxygen reached levels sufficient to support aerobic respiration.
D) Animals are heterotrophic and couldn't evolve until there were enough photosynthetic organisms on Earth to support being eaten by animals.
Correct Answer:
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