Between the ages of 12 and 20 what percentage of the brain's gray matter is purposefully lost?

Shio-Yuan has been under a great deal of job-related stress for the past few months, leading to the ____ of his immune system

a. ?strengthening b. ?defense c. ?destruction d. ?suppression

The outcome or effect in an experiment is the _____variable

A) ?independent B) ?dependent C) ?extraneous D) ?confounding