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.
Romans would always attribute the stability and success of their empire due to the virtue and strength of their men as well as the will of the gods.
If you plug in -2 then you can figure out by calculating