Life Itself: Its Origin and NatureA basic book about biology, the origin of life, and the origin of man. |
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Page 108
... evolution - what we have been considering the dif- ficult step - could hardly have taken a billion years and may have taken considerably less . Against this , the time for the single - celled organisms to take the next decisive step ...
... evolution - what we have been considering the dif- ficult step - could hardly have taken a billion years and may have taken considerably less . Against this , the time for the single - celled organisms to take the next decisive step ...
Page 109
... evolution . Once primitive animals with muscles and nerves have arrived , we can be confident , given a good mo- lecular mechanism for rapid evolution , that a visual system will develop . The ability to see gives an animal a ...
... evolution . Once primitive animals with muscles and nerves have arrived , we can be confident , given a good mo- lecular mechanism for rapid evolution , that a visual system will develop . The ability to see gives an animal a ...
Page 111
... evolution of a higher intelligence on earth depended crucially on this very drastic jolt given to evolution by the asteroid . Such a collision may not have been a unique event . There are other , earlier extinctions in the fossil record ...
... evolution of a higher intelligence on earth depended crucially on this very drastic jolt given to evolution by the asteroid . Such a collision may not have been a unique event . There are other , earlier extinctions in the fossil record ...
Contents
Times and Distances Large and Small | 19 |
The Cosmic Pageant | 29 |
The Uniformity of Biochemistry | 37 |
Copyright | |
11 other sections not shown
Common terms and phrases
amino acids asteroid atmosphere atoms bacteria Big Bang billion years ago CALIFORNIA carbon cell chance chemical reactions common compounds copied detail difficult Directed Panspermia distance DNA replication double helix easy energy environment enzymes ERSITY especially eukaryotes evolution evolved exactly fairly favorable fossil galaxy gene genetic code Hâ‚‚ happened higher hydrogen idea journey large numbers least Leslie Orgel LIBRARY light light-years living system mechanism messenger RNA microorganisms mitochondria molecular natural selection nitrogen nuclear nucleic acid oceans orbit organic molecules Orgel origin oxygen particular Perhaps planetary systems polypeptide chain possible prebiotic present primitive earth probably problem produced prokaryotes radiation rare event reason replication RNA molecules rocket SAN DIEGO scale seems simple small molecules solar system soup space spaceship speed stars started structure suitable planet surface temperature theory thousand tion tRNA UNIV universe unlikely