A. slow down as a response to the cooling temperature
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Because the mutation which does not have any effect on protein code I.e. even after the mutation if the gene still codes the same protein is called silent mutation
the outermost region of a planet's atmosphere
I believe mutation will make a population have more genetic variation. Genetic variation describes naturally occurring genetic differences among individuals of the same species. It is the difference in DNA sequences between individuals within a population. Variation permits flexibility and survival of a population in the face of changing environmental circumstances. It is considered an advantage, as it is a form of preparation for the unexpected.