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.
Evolution is an observed fact. Natural selection is the theory that *explains* that fact. In other words, when you understand that the word 'evolution' means 'change in the heritable properties of a population or species ... we can *measure* that change, so evolution is an observed fact. And natural selection is the theory that explains the fact of evolution ... WHY species change over time.