Which statement accurately describes the chemical symbol of an element?
the chemical symbol is always a single letter,
the chemical symbol always starts with the same letter as the name of the element.
the chemical symbol always begins with a capital letter,
the chemical symbol can be shared by more than one element.
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Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.