• [Mechanisms of evolution: Grades 13-16] Inherited characteristics affect the likelihood of an organism's survival and reproduction.
• [Mechanisms of evolution: Grades 13-16] Sexual selection occurs when selection acts on characteristics that affect the ability of individuals to obtain mates.
• [Mechanisms of evolution: Grades 13-16] An organism's fitness depends on both its survival and its reproduction.
• [Mechanisms of evolution: Grades 13-16] Fitness is often measured using proxies like mass, number of matings, and survival because it is difficult to measure reproductive success.
• [Nature of science: Grades 13-16] Scientific knowledge is open to question and revision as we come up with new ideas and discover new evidence.
• [Nature of science: Grades 13-16] A hallmark of science is exposing ideas to testing.
• [Nature of science: Grades 13-16] Scientists test their ideas using multiple lines of evidence.
• [Nature of science: Grades 13-16] Scientists can test ideas about events and processes long past, very distant, and not directly observable.
• [Nature of science: Grades 13-16] Scientific findings and evidence inspire new questions and shape the directions of future scientific research.
• [Nature of science: Grades 13-16] Science is a human endeavor.
• [Studying evolution: Grades 13-16] Scientists use experimental evidence to study evolutionary processes.

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• Natural Selection
• Nature of Science