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4. The blood vessels, heart and the blood make up
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10 points
a. 1/3 of our body
b. the respiratory system
c. 1/4 of our body
O d. the cardiovascular system

Respuesta :

adalynzoe2007

Answer:

D, the cardiovascular system

Explanation:

The Cardiovascular System is the system at which blood circulates through our body
D): the cardiovascular system because the blood vessels, heart and blood make up that system

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