Genetic variation is a measure of the genetic differences that exist within a population. The genetic variation of an entire species is often called genetic diversity. Genetic variations are the differences in DNA segments or genes between individuals and each variation of a gene is called an allele.For example, a population with many different alleles at a single chromosome locus has a high amount of genetic variation. Genetic variation is essential for natural selection because natural selection can only increase or decrease frequency of alleles that already exist in the population.
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body's water needs, conserving water if the body is dehydrated or making urine more dilute to expel excess water when necessary. ADH is a hormone that helps the body to retain water by increasing water reabsorption by the kidneys.
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i hope it helps
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look in explanation
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the answer should be B it was in quizlet!!! HINT when it comes down to english and science use quizlet it works amazingly when you can't find an answer
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morning and night
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as the sun rises your body gets hotter and as the sun sets your body gets cooler