Why earth is warmer at the equator?

Why is it hotter at the equator than it is at the poles? ... Because the sun's rays hit the earth's surface at a higher angle at the equator.

Explanation:

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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).