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When and in what habitat did animals likely originate, and when did today's major
groups of animals arise?​

Respuesta :

Answer: To our current understanding, animals first appeared in the Precambrian Era, during what is called the Cambrian Explosion, and they are believed to have arisen in shallow water environments, today's major groups of animals originated about 542 million years ago

Explanation:
I believe from the underground.

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