Family studies can indicate whether a trait runs in families,however they cannot provide conclusive evidence that a trait is influenced by heredity because
A) there are too many dependent variables in family studies.
B) random assignment is impossible in family studies.
C) there are no independent variables in family studies.
D) family members share not only genes, but also similar environments.

Question

Quizplus · Accepted Answer

Family members share not only genes but also similar environments, making it difficult to determine whether a particular trait or characteristic is solely influenced by heredity or by environmental factors. This is known as the nature vs. nurture debate. Therefore, family studies cannot provide conclusive evidence of heredity's influence on a trait.

Family Studies Can Indicate Whether a Trait Runs in Families,however