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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).
Scientists use this because it makes very large or very small numbers easier to work with.
An example of scientific notation would be instead of writing 0.0000000056, we write 5.6 x 10^-9
Is the B because the skin is the mejor organ of the second line of defense
