It is thought that the first cells probably arose about:

Name: It is thought that the first cells probably arose about:
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The most widely accepted theory is that the first cells arose around 3.5 billion years ago, during the early Archaean period, when the Earth's atmosphere was rich in methane, ammonia, hydrogen, and water vapor. These simple, single-celled organisms were the first living things on Earth and provided the foundation for all subsequent life forms.

It Is Thought That the First Cells Probably Arose About