The environment of Earth was hostile to life before 3.8 billion years ago.

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The early Earth was very different from the present-day Earth. The young planet was bombarded with asteroids and comets, and the atmosphere was dominated by carbon dioxide and other gases that would be deadly to most organisms. However, life on Earth is believed to have originated around 3.8 billion years ago, suggesting that some simple forms of life were able to survive and adapt to these harsh conditions.

The Environment of Earth Was Hostile to Life Before 3