________ carries oxygen and energy giving substances in food to all parts of the body.
A
Blood
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B
Air
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C
Lungs
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D
Muscles
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Solution
The correct option is A Blood ∙Circulation of blood is maintained by the heart. It pumps the blood continuously to every part of the body. ∙As the blood flows it takes oxygen from lungs and energy giving substances in food from the digestive system and circulates it to every part of the body.