Consider the model for natural selection. in a population of living things, genetic variation exists. one source of variation is mutation. which scenario listed here could be a mutation that causes members of a population to die out? a) in a population of fast-running cheetahs, some are born that run slower than most. b) in a population of sunflowers, mutations cause some flower heads to produce more seeds. c) in a population of brownish rabbits that live in the tundra, some are born with fur that turns white in the winter. d) in a populations of birds, mutations result in different beak sizes so the birds do not compete for food in t