why our lungs are expand during inhalation
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because our lungs gets filled with air and blood circulation continue to flow in all of the nerves.
ParamPatel:
oh you are college assistant
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Explanation:
It is difficult to pull the boat on the beach because of the friction between the boat and sand. But in the sea, there is less friction between the sea water and the boat. Hence, it is easier to pull the boat in the sea.
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