Biology CLEP Prep Practice Exam

Natural selection is the main driver of evolution because it is the process by which certain traits are favored and passed on to future generations, leading to changes in a species over time. This is due to the fact that individuals with advantageous traits are more likely to survive and reproduce, passing on those traits, while individuals with less advantageous traits are less likely to survive and reproduce.

Genetic drift, on the other hand, is a random process that can also contribute to evolution, but it is not the main driver. This occurs when there is a change in allele frequency within a population due to random events, such as natural disasters or chance mating. It is not driven by any selective pressure.

Genetic isolation, while it can also lead to evolution, is not the main driver as it is a result of external factors such as geographic barriers rather than a process within the population itself.

Artificial selection, also