Darwin's Theory of Evolution

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Darwins successful theory is best called "evolution by natural selectrion". He put it like this:

  • Organisms always produce far more offspring than are needed just to replace the previous generation. This leads to fierce competition between the offspring for scare resources: a "struggle for existence".
  • As a result of random changes (which we now trace to mutation of the genes to produce new alleles) these offspring differ from each other: they show variation.
  • Only the best-adapted features are passed on to the


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