13. In a study using brain scans, scientists found that teens with higher substance use between ages 16 and
18 had smaller gray matter volume at age 25 in which
part of the brain?
A. Pars opercularis
B. Amygdala
C. Ventral striatum
D. Cerebellum

Answer : ventral striatum.

Explanation : the third option

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People who utilizes the progression principle will ensure their exercise program increases in frequency, intensity, time, and type. the changes need to happen gradually in order to ensure they make gains in their fitness program. a person who doesn't utilize the progression principle can still gain health benefits from exercising, but will not continue to improve in cardiovascular fitness.