How does the climate of coastal regions compare with inland regions? a. coastal regions tend to be more stable. b. both regions are stable. c. both regions are variable. d. coastal regions tend to be more variable.

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.