Invertebrates were formed and active by the t | vedclass

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(C) According to the geological time scale and evolutionary history,the first invertebrates appeared and became active during the Cambrian period,whic

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(C) According to the geological time scale and evolutionary history,the first invertebrates appeared and became active during the Cambrian period,which occurred approximately $500$ million years ago (mya).This period marks a significant diversification of life forms in the fossil record.

Invertebrates were formed and active by the time of... (in $mya$)

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