Annual Premium Pay - pay at a percentage of the GS employee's annual rate (instead of the hourly overtime rate) for standby duty, administratively uncontrollable overtime work, or availability hours (5 CFR 550).
Studying evolution is an excellent way for students to learn about the process of scientific inquiry. Evolution offers countless and diverse examples of the ways scientists gather and analyze information, test competing hypotheses, and ultimately come to a consensus about explanations for natural phenomena.
Population genetic studies display an astonishing degree of genetic diversity, making understanding the generation and maintenance of genetic diversity a major focus of evolutionary biology. Mutation generates variation, but directional selection will remove variation, leaving the neutral process of genetic drift as a likely cause.