the answer to your question should be 4.Allergens
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The cardiovascular system is your heart and blood vessels. If it stopped working, that would affect your whole body
Things in motion tend to stay in motion, things at rest tend to stay at rest. Your brain never slowed down to the point where it would get tired to sleep. If you were laying in bed trying to sleep all night but couldn't that could be a medical disorder but if you were doing things you're fine
B. Plan a bike ride and picnic for his family.
<em>I hope this helps you!!!</em>
