A group of sheep run in random directions to confuse a single predator. This is an example of which social behavior? O migrating
O herding
O schooling
•
cooperative hunting

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

sorry, but you do not have posted the diagram.

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).