Answer: A)
Explanation:
The correct answer is A) because the circulatory and respiratory systems are working together in order to provide oxygen throughout the body.
They are helping the body to circulate blood and oxygen. Air is moving in and out of the lungs through a respiratory system which is including the trachea, bronchioles, and bronchi.
<span>Disease spreads faster in agrarian societies than in hunter-gatherer societies.
-False
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