Predict how each environmental condition—normal, windy, warm, and humid—might
affect the rate of plant transpiration. Rank the conditions from the lowest rate to the
highest rate, with number 1 being the lowest and number 4 being the highest.

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.