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Unformatted text preview: natural selection, survival of the fittest Requirements for natural selection: Variability: among organisms; traits can be structures or behavior Selection pressures: combined effect of all selection pressures at various levels determines the overall fitness of an individual, hence the outcome of natural selection Inheritance mechanism: genes, which are segments of chromosomes, control heredity Vestigial structures and importance to Darwin Anatomical, behavioral, biochemical structures that have lost their original function but remain there because of evolution; appendix, tailbone, muscles in ear Neoteny Juvenile features in adults; humans have flat faces throughout life, monkeys have flat face as infant, get longer faces as they get older...
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- Fall '08