Of all of the species of organisms that have ever existed on Earth, it is estimated that about _______ percent have gone extinct.

Name: Of all of the species of organisms that have ever existed on Earth, it is estimated that about _______ percent have gone extinct.
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It is estimated that about 99% of all species that have ever lived on Earth are now extinct. This highlights the vast number of species that have existed over the planet's history and the relatively small fraction that are alive today.

Of All of the Species of Organisms That Have Ever