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Kitty [74]
3 years ago
10

The most common of the psychoactive substances, used by 90% of americans, is __________.

Biology
1 answer:
Masteriza [31]3 years ago
5 0

The answer is caffeine. Caffeine is used as a stimulant to maintain alertness and reduce drowsiness. Caffeine is used to improve performance and most take it to allow them to continue working when they naturally feel tired or to stimulate the brain in the morning.  It is consumed in beverages such as tea, coffee, and soft drinks.






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