Plants receive carbon dioxide through their .

leaves,stomata

Explanation:

The carbon dioxide enters the leaves of the plant through the stomata present on their surface.

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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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).