AP BIOLOGY

Detailed explanation-1: -For example, adaptation to different environments might cause differences between populations in the way individuals tend to look, smell, and behave. In turn, these differences might cause individuals from different populations to avoid mating with one another, or hybrids exhibit reduced fitness if mating occurs.

Detailed explanation-2: -Natural selection, genetic drift, and gene flow are the mechanisms that cause changes in allele frequencies over time.

Detailed explanation-3: -Over time, these advantageous traits become more common in the population. Through this process of natural selection, favorable traits are transmitted through generations. Natural selection can lead to speciation, where one species gives rise to a new and distinctly different species.