Apopulation of white, grey, and black lizards lives on a volcanic island, and each phenotypic color has an equal chance of survival. however, after the latest volcanic eruption, 75 percent of the island was covered with volcanic ash and hardened lava flows. this event caused the black lizards to be naturally selected over the white and grey lizards. this change is an example of what type of microevolution? a) stabilizing selection b) normal distribution c) directional selection d) disruptive selection