Some owls produce 2 pellets per day. assume each pellet represents 80 g of biomass. also assume that one 40g vole can cause 50 cents of crop damage to a farm per growing season. if a barn owl family of seven ( 2 adults [producing 2 pellets/day] and 5 young[producing 1 pellet/per day]) lives on the farm for 12 weeks ( one growing season) and feed exclusively on voles, how much will the farmer save in crop damages over the course of growing season? must show all work

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.