Answer:
Depression
Explanation:
Depression is usually linked to an under-supply of serotonin because serotonin is consider the "happy" endorphin
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Answer: Ambulatory monitoring of the electrocardiogram in 100 healthy 14 to 16 year old boys showed heart rates ranging from 45 to 200 beats/minute during the day and from 23 to 95 beats/minute during sleep.
