Answer: D. Identical twins who are reared apart have similar levels of intelligence
Explanation:
Biological factors include the genetic influences, hormone levels, brain chemistry, gender and nutrition and how they affect development.
The research findings that supports a strong biological basis for behavior is the identical twins who are reared apart have similar levels of intelligence. Due to the fact that they are from same parents, they may have similar intelligence level.
Reinforcement adds SOMETHING/ INCREASE the situation in order to INCREASE the target behavior, while punishment REMOVES SOMETHING/ DECREASE the situation in order DECREASE the target behavior.
