Forming Fossils

Beginnings of Life

Did life develop more than just one time?

Many scientists believe that life may have started over and over on Earth. They speculate that once life began—either around ocean vents and/or in the shallow seas—comets and asteroids would strike the planet, killing off all the beginning stages of life. This may have happened many times over millions of years, until life became stable enough to sustain and diversify itself.


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