The first of the four forces of evolution is genetic drift. Genetic drift is a random occurrence among species and is a way in which specific individuals' genetics will carry over into the next generation gene pool. This process happens when a species' alleles randomly change frequencies. This happens to the point where a gene is either no longer represented in the gene pool or is the entire representation of the gene pool (more likely with a smaller population). The second of the four forces of evolution is natural selection. Natural selection is a term that refers to a species' ability to survive by way of adaptation to its surrounding environment. Natural selection also refers to the species that cannot adapt and therefore perish. Animals
