Blacknad wrote:
[QUOTE]And again the two following definitions of altruism are being used interchangeably:

1. Instinctive cooperative behavior that is detrimental to the individual but contributes to the survival of the species.

2. Unselfish concern for the welfare of others; selflessness.[QUOTE]

As an animal, humans herd together for protection, food and sex. To get those things, some individuals are forced to place their lives on the line to prove their value to the herd. Risking death ensures acceptance and appreciation from the herd.
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Sue