By the time of ...... mya,invertebrates were | vedclass

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(D) According to the geological time scale and evolutionary history,invertebrates were formed and became active by approximately $500$ million years a

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$500$

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(D) According to the geological time scale and evolutionary history,invertebrates were formed and became active by approximately $500$ million years ago (mya). This period corresponds to the Cambrian period,which is known for the 'Cambrian explosion' of life forms,where a rapid diversification of multicellular organisms occurred,including the appearance of most major invertebrate phyla.

By the time of $......$ mya,invertebrates were formed and became active.

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