ANSWERS: 2
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Possibly; http://en.wikipedia.org/wiki/Hygiene_hypothesis
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Sorta maybe. The evolution of our brains to the point where we are able to control the environment around us has been our big evolutionary 'trick' so to speak. So our body's relative strength, defences and so on are less important (for want of a better phrase) than our ability to discover threats and use intelligence to work out a way around them...
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