Question 17 of 25 Which is an example of a mathematical model of a landslide? O A. Pouring dirt down the side of a hill and photographing it O B. Thinking of a landslide as a river flowing downhill O C. Making a model of a mountain out of clay D. Using calculations to predict when a landslide will happecompyter​

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.