Discuss how man adapted to his environment.

Humans are generally adapt the environment to suit themselves which is why we have air conditioning in hot countries and central heating in colder countries.

Throughout human evolutionary history, breast feeding cessation typically occurred around the age of 2 or earlier. This meant that our digestive system no longer had the need for breaking down the milk sugar lactose as it was very rarely part of the paleo-/hunter-gatherer diet. To save energy producing a redundant protein our bodies stopped.

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