a scientist observing a specific species over a long period of time notices an increase in the frequency of intermediate phenotypes and a decrease in the frequency of extreme phenotypes. what is the best explanation for this observation? option a) disruptive selection is creating a shift in phenotypes due to environmental conditions. option b) intermediate phenotypes are increasing due to directional selection in response to environmental conditions. option c) stabilizing selection is occurring in response to environmental conditions. option d) extreme phenotypes are increasing due in response to a change in environmental conditions. chatgpt
