More than 99 percent of all species, amounting to over five billion species, that ever lived on Earth are estimated to be extinct. Estimates on the number of Earth's current species range from 10 million to 14 million, of which about 1.2 million have been documented and over 86 percent have not yet been described
There are currently seven billion people alive today and the Population Reference Bureau estimates that about 107 billion people have ever lived.
There are currently seven billion people alive today and the Population Reference Bureau estimates that about 107 billion people have ever lived.
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