Which describes the correct pairing of DNA bases? A. C with T, and G with A
B. C with C, and G with G

C. C with A, and G with T
D. C with G, and A with T

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.