In every population there is variation. It is important that this variation.

Genetic variation is an important force in evolution as it allows natural selection to increase or decrease frequency of alleles already in the population.

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the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

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