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For billions of years, life on Earth had included only microbes, and simple soft-bodied organisms. Then, within just a few tens of millions of years, a variety of complex aquatic animals appeared.
By Indiana Public Media4.8
2323 ratings
For billions of years, life on Earth had included only microbes, and simple soft-bodied organisms. Then, within just a few tens of millions of years, a variety of complex aquatic animals appeared.

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