Around ________ adults over the age of 50 report smoking within the previous month.

Professor Garcia is explaining how neurons communicate with each other. She says, "Neurons speak to each using ________ language."

a. an electrical and chemical b. the individual's c. a binary d. an acoustic

The pupil is the ______

a. opening in the center of the iris c. white of the eye b. colored part of the eye d. lining in the back of the eyeball