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billion
«We are the product of 4.5 billion years of fortuitous, slow biological evolution. There is no reason to think that the evolutionary process has stopped. Man is a transitional animal. He is not the climax of creation.»
Author: Dr. Carl Sagan
(Astronomer, Scientist, Writer)
| Keywords:
animal, billion, biological, climax, Creation, evolution, evolutionary, fortuitous, product, slow, stopped, thought process, transitional