Earlier in the course we discussed the concept of Social Darwinism and the idea that the implication of evolution is that humans are by nature competitive, even that competition with clear winners and losers for resources is good for humans. Damasio speaks of cooperation as the most important result of human evolution. Explain how cooperation could arise in evolution? Is this idea compatible with Social Darwinism or contradictory to it? Is there biological evidence to support either or both?