Before the Ordovician-Silurian extinction, the diversity of life on Earth was growing enormously due to _____.

1 answer:

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The answer is shallow, warm, continental seas.

The Ordovician-Silurian extinction happened about 450-430 million years ago. Before the extinction, most multicellular organisms lived in the seas. It was a rich life in shallow, warm, and continental seas. The climate was favorable. Reef-forming corals, as well as the first true vertebrates, some fish, appeared. Trilobites and mollusks were diverse and rich. Green algae were common in the seas.

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During binary fission, the parent simply divides to produce young ones.
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It is only in sexual reproduction that genetic materials are exchanged between the parents and offspring. This leads to genetic variation.

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