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<p>of <a href="page.php?w=reciprocal_altruism">reciprocal altruism</a>, a form of <a href="page.php?w=altruism">altruism</a> in which one organism provides a benefit to another in the expectation of future <a href="page.php?w=Norm_of_reciprocity">reciprocation</a>.<br/>
*The <a href="page.php?w=Trivers-Willard_hypothesis">Trivers-Willard hypothesis</a>, which proposes that parents should invest more in the sex that gives them the greatest reproductive payoff (grandchildren) with increasing or marginal investment.<br/>
*<a href="page.php?w=r%2FK_selection_theory">r/K selection theory</a>,</p><p>
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