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14 June, 18:01

What important event in animal evolution marks the beginning of the Cambrian period?

the ability to swim

the ability to fly

the appearance of hard parts

the appearance of fossils

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  1. 14 June, 18:09
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    The best answer would be C.) because before this, there were no real "hard" organisms which is why there were not many fossils that could be found.
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