Concept:Evolutionary trends are long-term changes in species, including rising genetic variation that supports adaptation.
Explanation:Natural selection and mutation increase genetic diversity within populations over time.
More genetic variety gives populations a wider pool of traits for natural selection to act on.
This improves the chance of survival when environmental conditions change.
Options A, B, and D describe patterns that oppose successful adaptation, so they are not common evolutionary trends.
Answer:C. Increased genetic diversity within populations