Which situation would probably not result in the formation of new species? a) the introduction of a predatory fish that only eats the largest native bass in a georgia lake. b) a period of stable weather conditions that lasts for hundreds of years, allowing a species of grass to do well. c) a mutation that causes a purple color form to appear in peacock males, which the peahen females seem to either strongly like or dislike. d) isolation of a population of lizards on an island, which later becomes too distant from the mainland for other lizards to swim to the island.