Paleontologists have examined the fossil record to determine that 99.9% of all species that ever existed have become extinct.

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Paleontologists estimate that over the course of Earth's history, the vast majority of species that have existed are now extinct, with estimates often cited around 99.9%. This is based on the fossil record and the understanding of species turnover over millions of years.

Paleontologists Have Examined the Fossil Record to Determine That 99