This lesson focuses on . Key concepts include:

This paragraph explains the mechanism of natural selection and its role in adapting organisms to their environment. Summary of Paragraph 57

Favors phenotypes at one extreme, leading to a shift in traits when environmental conditions change.

Favors individuals at both extremes of a trait distribution, potentially leading to the formation of two distinct groups.

This lesson details , which Darwin identified as the primary creative force in evolution. Main forms include:

Sudden, stable changes in the genotype that can be beneficial, harmful, or neutral.