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13 - Territorial behavior
P1 - Human territorial behavior is motivated by both culture and instinct.
Territoral instinct can evolve in animal species for some vital resources effecting population density.
population density increases => food or water rate => death and birth rates come into balance the population desity
=> Individuals genetically predisposed to defend resource have higher survival rates
P2 - Not every species develops such instinct.
A species' polulations density could be leveled off by emigration, disease or predation.
In such case, territoriality usually doesn't evolve.
P3 - Humans are territorial. Their war over territory arise from instinct+ culture
= understand how these elements' interact to avoid the war.
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