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What is the predominant hypothesis why animals only appeared in the fossil record about 3 billion years after life originated?

What is the predominant hypothesis why animals only appeared in the fossil record about 3 billion years after life originated?
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What is the predominant hypothesis why animals only appeared in the fossil record about 3 billion years after life originated?

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User Terrell Plotzki
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A. There were animals 3 billion years ago; they just weren't fossilized. B. Animals are warm-blooded; the ocean was too cold for animals.
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User Seanrose
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