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Natural Selection

Natural selection is a process whereby organisms best adapted for their environment will survive and reproduce.

Natural selection is based on several key observations proposed by Darwin:

  • Traits are inherited - This means that the best-adapted organisms will pass their characteristics down to their off-springs which over millions of years is effectively the process of evolution.

  • More off-springs are produced than can survive - This means that there is competition for food and resources which also means that only the fittest will survive (survival of the fittest)

  • Heritable traits will vary from organisms - Each off-spring will be slightly different to a different off-spring 

After Darwin had made these observations, he devised a conclusion:

  • Organisms will have off-springs with different inherited traits that will have better traits suited for their environment. The individuals that have the most suitable traits will have more chances of survival and reproduction.

  • Since the most suited traits are heritable, and because the organisms with the most suit=able traits will eave ore off-springs, the most suitable traits will become more common.

  • Over many years, the population will become more adapted to the environment.