Different members of a species show ____. This means that they have different features/characteristics. These differences are caused by genetic ____ - ____ changes to the ____ of an organism. Some organisms will have useful characteristics, or ____, which help it survive. These organisms are more likely to survive and ____, passing on the characteristic to their ____. Eventually, over many ____, this characteristics will become "normal" for the species. Other organisms will have ____ characteristics. These organisms will not ____ long and be unable to reproduce. Over time, this characteristic will be ____.

Natural Selection

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