Aplant 3 in. tall grows an average of 0.5 in. each month. which equation models the flowerís height h after x months?
3 = x + 0.5
h = 0.5x + 3
h = 3x + 0.5
h = 0.5 = x + 3

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.