) The Hardy-Weinberg provides a baseline for identifying how populations evolve because it looks too see if gene frequencies have changed in a specific population in order to conclude if evolution has occurred or not. The Hardy-Weinberg principle explains a population that does not have evolution if there is no mutation, no immigration, no natural selection, no sexual selection, and a large population. 3) This study explains why concentrated populations of black squirrels are found commonly in northern city parks. Because if black squirrels shiver less in cold weather than grey squirrels, then it means that they are naturally selected to be in colder weathers and that they are going to have higher rates of survival in colder environments