Evolution: A Scientific American ReaderScientific American University of Chicago Press, 2008 M09 15 - 312 páginas From the Scopes “Monkey Trial” of 1925 to the court ruling against the Dover Area School Board’s proposed intelligent design curriculum in 2005, few scientific topics have engendered as much controversy—or grabbed as many headlines—as evolution. And since the debate shows no signs of abating, there is perhaps no better time to step back and ask: What is evolution? Defined as the gradual process by which something changes into a different and usually more complex and efficient form, evolution explains the formation of the universe, the nature of viruses, and the emergence of humans. A first-rate summary of the actual science of evolution, this Scientific American reader is a timely collection that gives readers an opportunity to consider evolution’s impact in various settings. |
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... molecular gas clouds. Furthermore, the cosmological models can provide, in principle, a complete description of the initial conditions that preceded the first gen- eration of stars. In contrast, the stars that arise from molecular gas ...
... molecular hydrogen. The hy- drogen molecules would then start to cool the densest parts of the gas by emitting infrared radiation after they collide with hydrogen atoms. The temperature in the densest parts would drop to about 200 to ...
... molecular gas clouds in which most stars currently form . Dust grains and molecules containing heavy elements cool the present - day clouds much more efficiently to temperatures of only about 10 kelvins . The minimum mass. THE FIRST ...
... molecular clouds. But because the temperatures of the first collapsing gas clumps were almost 30 times higher than those of molecular clouds, their Jeans mass would have been almost 1,000 times larger. In molecular clouds in the nearby ...
... molecules . This reducing environment also provides an energy source to help organic molecules combine into larger structures and to foster primitive metabolic reactions . WHERE DID LIFE ORIGINATE ? The significance of hydrothermal ...
Contenido
Cellular Evolution | 85 |
Dinosaurs and Other Monsters | 169 |
Human Evolution | 249 |
Contents | 362 |
Illustration Credits | 364 |
The Evolution of the Universe | 1 |
Cellular Evolution | 85 |
Dinosaurs and Other Monsters | 169 |
Human Evolution | 249 |