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In primate species (bare with me, i'm studying for an anthropology exam) altruism is used in two different forms:
reciprocal altruism: doing a favor so that a favor will be done to you
Kin altruism: (i.e. "taking one for the team") sacrificing oneself for the benefit of the family in order to ensure that the family genes will be passed on.
*sigh*
Hope I remember that tomorrow.
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