Natural Selection is a process in which certain traits become more common or not. This is determined by the necessity of certain traits and the environment the species finds itself in. Natural selection only acts on existing traits because they are the traits active in a given species in a given environment.
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I think you mean molecule not Michal so the answer is: the concentration of the molecule may be too low to be detected
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A. a lack of permanently frozen soil.
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Iron and Magnesium are the elements