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Key insights that led Darwin to the theory of evolution: ïµ Artificial selection- Darwin noticed a lot of variation of traits in domesticated animals and plants. Humans can increase the chances of certain traits being passed down. ïµ Heritability â Natural Selection can only act on traits that already exist. Traits must be heritable in order to be passed down ïµ Struggle for survival â There is only so much food and resources available so only the most âfitâ survive.