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What important event in animal evolution marks the beginning of the Cambrian period? A. the appearance of fossils B. the appearance of hard parts C. the ability to swim
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What important event in animal evolution marks the beginning of the Cambrian period?

A. the appearance of fossils

B. the appearance of hard parts

C. the ability to swim

User Dylan Hand
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4 votes

Answer:

The Answer is The appearance of hard parts

Step-by-step explanation:

User Niuer
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