Scientists have found that, on average, as people's stress levels increase, the functioning of their immune system decreases. This is an example of ______.
A) a neutral correlation
B) a positive correlation
C) a selection factor
D) a negative correlation

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The Answer of Scientists have found that, on average, as people's stress levels increase, the functioning of their immune system decreases. This is an example of ______.
A) a neutral correlation
B) a positive correlation
C) a selection factor
D) a negative correlation

Scientists Have Found That, on Average, as People's Stress Levels