Microorganisms dominated Earth's ecosystems for most of the planet's history.

Name: Microorganisms dominated Earth's ecosystems for most of the planet's history.
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Microorganisms such as bacteria and archaea have been present on Earth for over 3.5 billion years and were the dominant form of life for the majority of that time. It was only in the last few hundred million years that more complex organisms such as plants and animals began to evolve and become more prominent.

Microorganisms Dominated Earth's Ecosystems for Most of the Planet's History