Question

___is the formed more than 570 million years ago.​

Answer 1

Answer:

By 600 million years ago, the oxygen in the atmosphere reached about one-fifth of today's level (21 percent). The oxygen boom favored the evolution of lifeforms that could use oxygen to create energy. For other organisms, oxygen was poisonous, and they were forced into extreme airless habitats or into extinction.

Answer 2

Answer:

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Explanation:

Cambrian