How do psychologists define intelligence?

The approach that contends psychology must study internal mental events in order to fully understand behavior is:

Which best explains why the number of states in the world increased significantly between 1985 and 1995? the map of southeast asia was redrawn, and new countries were formed. new states were formed when the soviet union collapsed. many african states received independence from their colonizers. communist countries seeking to spread their influence created new satellite states. civil wars in central america fueled the creation of new states.

Which statement indicates one difference between the gene that codes for insulin and the gene that codes for testosterone in humans?