• [Evidence of evolution: Grades 6-8] An organism's features reflect its evolutionary history.
• [Evidence of evolution: Grades 6-8] There is a fit between organisms and their environments, though not always a perfect fit. (LS4.C)
• [Evidence of evolution: Grades 9-12] An organism's features reflect its evolutionary history.
• [Evidence of evolution: Grades 9-12] There is a fit between organisms and their environments, though not always a perfect fit. (LS4.C)
• [Evidence of evolution: Grades 13-16] There is a fit between organisms and their environments, though not always a perfect fit.
• [Mechanisms of evolution: Grades 6-8] Evolution results from natural selection acting upon variation within a population. (LS4.B)
• [Mechanisms of evolution: Grades 6-8] There is variation within a population. (LS3.B)
• [Mechanisms of evolution: Grades 6-8] Variation is the result of genetic recombination or mutation. (LS3.A)
• [Mechanisms of evolution: Grades 6-8] The variation that occurs within a population is random.
• [Mechanisms of evolution: Grades 6-8] Traits that are advantageous often persist in a population. (LS4.B, LS4.C)
• [Mechanisms of evolution: Grades 6-8] Environmental changes may provide opportunities that can influence natural selection. (LS4.B, LS4.C)
• [Mechanisms of evolution: Grades 9-12] Evolution occurs through multiple mechanisms.
• [Mechanisms of evolution: Grades 9-12] Evolution results from selection acting upon genetic variation within a population. (LS4.B)
• [Mechanisms of evolution: Grades 9-12] There is variation within a population. (LS3.B)
• [Mechanisms of evolution: Grades 9-12] Natural selection acts on the variation that exists in a population. (LS4.B, LS4.C)
• [Mechanisms of evolution: Grades 9-12] Natural selection acts on phenotype as an expression of genotype.
• [Mechanisms of evolution: Grades 9-12] Mutations are random.
• [Mechanisms of evolution: Grades 9-12] Organisms cannot intentionally produce adaptive mutations in response to environmental influences.
• [Mechanisms of evolution: Grades 9-12] Inherited characteristics affect the likelihood of an organism's survival and reproduction. (LS4.B, LS4.C)
• [Mechanisms of evolution: Grades 9-12] Populations, not individuals, evolve.
• [Mechanisms of evolution: Grades 9-12] Traits that confer an advantage may persist in the population and are called adaptations. (LS4.B, LS4.C)
• [Mechanisms of evolution: Grades 9-12] Over time, the proportion of individuals with advantageous characteristics may increase due to their likelihood of surviving and reproducing. (LS4.B, LS4.C)
• [Mechanisms of evolution: Grades 9-12] Environmental changes may provide opportunities that can influence natural selection. (LS4.B, LS4.C)
• [Mechanisms of evolution: Grades 13-16] Evolution is often defined as a change in allele frequencies within a population.
• [Mechanisms of evolution: Grades 13-16] Evolution results from natural selection acting upon genetic variation within a population.
• [Mechanisms of evolution: Grades 13-16] Evolution results from mutations.
• [Mechanisms of evolution: Grades 13-16] Natural selection and genetic drift act on the variation that exists in a population.
• [Mechanisms of evolution: Grades 13-16] Mutation is a random process.
• [Mechanisms of evolution: Grades 13-16] Organisms cannot intentionally produce adaptive mutations in response to environmental influences.
• [Mechanisms of evolution: Grades 13-16] Evolution does not consist of progress in any particular direction.
• [Nature of science: Grades 6-8] Scientists test their ideas using multiple lines of evidence.
• [Nature of science: Grades 9-12] A hallmark of science is exposing ideas to testing. (P3, P4, P6, P7)
• [Nature of science: Grades 9-12] Scientists test their ideas using multiple lines of evidence. (P6, NOS2)
• [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.
• [Studying evolution: Grades 6-8] Scientists use multiple lines of evidence to study life over time.

• Disciplinary Core Idea LS3.A : Inheritance of Traits
• Disciplinary Core Idea LS4.B: Natural Selection
• Disciplinary Core Idea LS4.C: Adaptation

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