In the previous lesson, you experimented with the concept of predation. In other words, you investigated how the mice being eaten by predators affected the population of mice differently in different types of environments. In nature, some individuals with certain traits (like fur color) have better fitness to survive and create offspring that can inherit those traits. In the case of our models, mice with certain phenotypes might have a advantage over other mice in different environmental conditions. Traits that gives an advantage would get passed to the next generation. As these traits are passed from each generation to the next, this process causes populations to change over time. We call these sorts of changes in populations natural selection.
