Your sister is pregnant and wonders how her baby takes in nutrients and gets rid of waste products. You tell her that it happens through a structure called a(n)

Axons are

A) clusters of fibers at the end of neurons that receive messages from neurons. B) small gaps between neurons. C) neurotransmitters. D) long extensions at the end of neurons that carry messages away from neurons.

The 30% of American teens who finish high school but do not go on to college are often referred to as

A) big time losers. B) the forgotten half. C) the newly unemployed. D) the undereducated.