Many bacteria reproduce using a process called during which the bacterial chromosome replicates, and the bacterium pinches into two separate cells.

a: binary fission
b: meiosis
c: sexual reproduction

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explanation:

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).