The Earth supports the only known life in the universe, all of it depending heavily on the presence of liquid water to facilitate chemical reactions. While single-celled life has existed almost as long as Earth itself, it took roughly three billion years for multicellular life to form. Human life has existed for less than one-10 thousandth of the age of Earth.



Summary

Earth is unique as the only known planet harboring life, crucially dependent on liquid water for biological processes. Though single-celled organisms appeared early in Earth’s history, multicellular life took an extensive three billion years to emerge. Remarkably, humans, in comparison, have only existed for a tiny fraction (less than one ten-thousandth) of Earth’s total lifespan, highlighting the relatively recent arrival of our species on this ancient planet.

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