Labels:bulletin board | reckoner | window OCR: 3.If a large extraterrestrial body had not struck the earth 65 million vears ago then dinosaurs still be dominant and mammals insignificant (the situation that had prevailed for 100 million years previously) 4.Ifa small lineage of primates had not evolved upright posture on the drying African savannas just two to four million years ago then our ancestry might have ended ina line of apes that like the chimpanzee and gorilla today, would have become ecologically margina and probably doomed to extinction despite their remarkable behavioral complexity Theref fore to understand the events and generalities of life's pathway we must go beyond principles of evolutionary theory to a paleontological examination of the contingent pattern of life's history on our planet the single actualized version a ...
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