MS-LS4-4 - Construct an explanation based on evidence that describes how genetic variations of traits in a population increase some individuals’ probability of surviving and reproducing in a specific environment.

Clarification Statement - Emphasis is on using simple probability statements and proportional reasoning to construct explanations.

8.MS-LS4-4 - Use a model to describe the process of natural selection, in which genetic variations of some traits in a population increase some individuals’ likelihood of surviving and reproducing in a changing environment. Provide evidence that natural selection occurs over many generations.

Clarification Statement - The model should include simple probability statements and proportional reasoning. Examples of evidence can include Darwin’s finches, necks of giraffes, and peppered moths.

Assessment Boundary - Specific conditions that lead to natural selection are not expected in state assessment.