Question

Monozygotic (identical) and dizygotic (fraternal) twins who were separated early in life and raised in different environments provide the simplest and most powerful method for studying the impact of nurture (environment) and nature (genetics) on human characteristics. Monozygotic (identical) twins share the same genetic makeup. If they are raised in different environments, researchers are able to clearly examine the impact of environment, since genetics are identical.
Sample
"More than 100 sets of twins or triplets from across the United States and United Kingdom have participated in the Min