3.2.6 - Twin studies

3.2.6 The use of twin studies to investigate genetic relatedness and aggression.

Use - twin studies to connect the rule to the data and decision in the question.

This matters because - twin studies determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply - twin studies to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: - Twin studies is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.