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Within sexual selection Darwin identified a further two mechanisms which are important factors in the evolution of sex differences (sexual dimorphism): intrasexual selection (involve competition with those of the same sex over access to mates) and intersexual choice (discriminative choice of mating partners).An overarching evolutionary theory which can provide an explanation for the above mechanisms and strategies adopted by individuals which leads to age disparity in relationships is called Life History theory, Life History theory posits that individuals have to divide energy and resources between activities (as energy and resources devoted to one task cannot be used for another task) and this is shaped by natural selection.For example, different age preferences may be a result of sex differences in mate values assigned to the opposite sex at those ages.A study conducted by David Buss investigated sex differences in mate preferences in 37 cultures with 10,047 participants.

Report on the Vertebrate Fauna from CA-STA-207, Central Diablo Range, Stanislaus County, California: Evidence for an Upland Adaptation with Long-Term Stability in the Central Diablo Range (SCA Proceedings - PDF]. Elsasser [JCGBA]."Archaeological Investigations on Pilot Ridge, Six Rivers National Forest," "Archaeological Investigations on South Fork Mountain, Six Rivers and Shasta-Trinity National Forests," and "Archaeological Investigations on Pilot Ridge: Results of the 1984 Field Season," reviewed by Winfield G. ORG, and the CALIFORNIAPREHISTORY MASTHEAD are all trademarks of Coyote Press, Gary S.

[Journal of Anthropological Archaeology -61.]Sampling Issues in Evaluations of Diet and Diversity: Lessons from Diablo Canyon. [In Human and Marine Ecosystems: Archaeological and Historical Ecology of Northern Pacific Seals, Sea Lions, and Sea Otters, edited by T. Report on the Vertebrate Fauna from CA-STA-207, Central Diablo Range, Stanislaus County, California: Evidence for an Upland Adaptation with Long-Term Stability in the Central Diablo Range (SCA Proceedings - PDF].

[In Exploring Methods of Faunal Analysis: Perspectives from California Archaeology, edited by Michael A. Another Trans-Holocene Sequence from Diablo Canyon: New Faunal and Radiocarbon Findings from CA-SLO-585, San Luis Obispo County, California.

Thus, both sexes will have to compete and be selective in mate choices.

These two theories explain why natural and sexual selection acts slightly differently on the two sexes so that they display different preferences.

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