Researchers may (have)used twins to create a matched set of participants based on genetics.

Question

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Twin studies are commonly used in research to control for genetic and environmental factors by comparing identical twins who share 100% of their genetic material to fraternal twins who share only 50% of their genetic material, as well as non-twin siblings and unrelated individuals. This allows researchers to investigate the contributions of genes and environment to a variety of traits and behaviors.

Researchers May (Have)used Twins to Create a Matched Set of Participants