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It Has Gotten Dark,and Soon the Whole Family Is Feeling

Question 47

Multiple Choice

It has gotten dark,and soon the whole family is feeling tired.This shared experience occurs because everyone has:


A) had a lot of exercise that day
B) participated in a chain reaction of yawning
C) increased their melatonin production over the course of the day
D) increased their serotonin levels over the course of the day

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