As a change manager, I like the questions you raised. What pushes evolution fascinates me. Serendipitously, I came across this article today where others link species survival to altruism.
Forget Survival of the Fittest: It Is Kindness that Counts (http://www.sciam.com/article.cfm?id=kindness-emotions-psychology)
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Forget Survival of the Fittest: It Is Kindness that Counts (http://www.sciam.com/article.cfm?id=kindness-emotions-psychology)