Darwin (1859, cited in Gross, 1988) in his book on the Origin of Species (1859) stated species evolved through the process of natural selection in which only the fittest survive. This implies selfish behaviour. However, some species do show altruism (e.g., rabbits banging on the ground to alert others of danger). Altruism has been defined as helping someone in need with no expectation of receiving something in return. Humans also show altruism but psychologists have questioned is it truly selflessness that motivates us to help others or do we receive some reward in return.
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