by 
Puth15
ANSWERS: 4
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Genetic Mutations
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The struggle for existence produces variations and natural selection determines which of those variations is most successful in the struggle for existence.
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It depends how you would define the variation, but for the most part it would be genetic mutation and hybridisation.
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gentic processes such as meiosis(crossing over and random asssortment at the poles), fertilisation, mutations(environmental, gentic and chromosones) and hybridsation.
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