One group of chimpanzees slurps termites directly from a stick, another group picks them off the stick one by one. one group of chimpanzees breaks nuts with a stone hammer; another group does this with a wooden hammer. these group differences in food-gathering practices best illustrate

literally no idea maybe natural selection def not

Explanation:

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).