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Часто встречающиеся слова и выражения. Furthermore, cloacal diversity and variability were found to decrease with age in polyandrous females. Massot M, Clobert J, Pilorge T, Lecomte J, Barbault R Density dependence in the common lizard - Demographic consequences of a density manipulation. What often happens is that a man desires a woman, based upon his instinctive criteria -- what does she look like? This page was last edited on 24 June , at She asked, "Do you see a boyfriend?
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Sexual Selection and Animal Genitalia. But it could also be that people who have more partners have different personalities or different attitudes toward marriage or relationships. As formulated in Bateman's principle, females have a greater initial investment in producing offspring pregnancy in mammals or the production of the egg in birds and reptiles , and this difference in initial investment creates differences in variance in expected reproductive success and bootstraps the sexual selection processes. Trivers defined parental investment as any investment made by the parent that benefits his or her current offspring at the cost of investment in future offspring.
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