Basic cause of variations is

Outcrossing

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Incrossing

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Recombination

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Mutation

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Solution

The correct option is C Mutation
Genetic variation is used to describe the variation in the DNA sequence in each of our genomes.
Mutations are changes in the DNA. A single mutation can have a large effect, but in many cases, evolutionary change is based on the accumulation of many mutations.
So, the correct answer is 'Mutation'

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