__________ improves the efficiency of message transfer

People who work in skilled and semiskilled manual occupations tend to __________ than people in professional and technical occupations

A) marry later B) have more children C) have fewer children D) have children later

The ______ procedure allows for the labeling of ______ in the living human brain

A) diffusion tensor imaging; collections of cell bodies B) CAT scan; axons C) diffusion tensor imaging; bundles of axons D) CAT scan; dendrites E) light microscope scan; vesicles