I have lived a thousand years timeline1/13/2024 However, a 2016 report estimates an additional 1 trillion microbial species, with only 0.001% described. Estimates on the number of Earth's current species range from 10 million to 14 million, with about 1.2 million or 14% documented, the rest not yet described. More than 99 percent of all species that ever lived (over five billion) are estimated to be extinct. The similarities between all present day organisms imply a common ancestor from which all known species, living and extinct, have diverged. Evolutionary processes give rise to diversity at every level of biological organization, from kingdoms to species, and individual organisms and molecules, such as DNA and proteins. In biology, evolution is any change across successive generations in the heritable characteristics of biological populations. Dates in this article are consensus estimates based on scientific evidence, mainly fossils. The timeline of the evolutionary history of life represents the current scientific theory outlining the major events during the development of life on planet Earth.
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