Natural selection

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1

Individuals are not all the same because of differences in their genes. So there is variation within populations of organisms.

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Most organisms produce more young than can survive to adulthood.

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There are no enough resources for organisms to live longer.

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The limited supply causes competition between species. 

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Those individuals with variation that are better adapted will be most likely to survive and the poorly adapted ones will die.

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Individuals that survive may breed to reproduce and pass their advantageous variation/ characteristics to their offspring.

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