What was it like when humans first arose on planet Earth?
Big Think -

It’s hard to imagine, given how abundant and macroscopic life on Earth is today, but for nearly all of Earth’s history — upward of three billion years and likely closer to four — there were no organisms more complex than a single-celled life form on our world. It wasn’t until the Earth itself was nearly four billion years old that the advent of large plants and animals finally occurred. Complexity exploded around that time, as the combination of multicellularity, sexual reproduction, and other...

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