Earth Quotes by David M. Raup

David M. Raup

In the beginning, there were bacteria…. [A] nearly universal assumption is that all subsequent life descended from the original life form through a continuous chain of ancestor-descendant pairs. This assumption looks good because all living organisms share biochemical traits. It is conceivable, of course, that life originated more than once on the early earth but that all except one life form died out early, leaving a single lineage as the ancestor of life as we know it. If this did happen, it was the first important species extinction.

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David M. Raup

There are millions of different species of animals and plants on earth–possibly as many as forty million. But somewhere between five and fifty BILLION species have existed at one time or another. Thus, only about one in a thousand species is still alive–a truly lousy survival record: 99.9 percent failure!

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