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  1. Alveoli is related to which of the following system of human body?

    2. A.

     Circulatory system
    B.

     Excretory system
    C.

     Reproductive system
    D.

     Respiratory system

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    Answer : Option D

    Explanation :

    Alveoli are tiny air sacs in your lungs that take up the oxygen you breathe in and keep your body going. Although they're microscopic, alveoli are the workhorses of your respiratory system.

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