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

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:

the  frequency of a wave represents  the number of wavelengths that pass a specific point per second. the unit for  frequency  is hertz (hz).

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