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What is the most significant difference between Precambrian and Paleozoic life-forms?

What is the most significant difference between Precambrian and Paleozoic life-forms?
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What is the most significant difference between Precambrian and Paleozoic life-forms?

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User Cxyz
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The Pre-Cambrian/Paleozoic boundary is classically the point where the fossilized shells of animals suddenly appeared in the stratigraphic record

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User Aleh Zasypkin
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