ਫੇਫੜਿਆਂ ਵਿੱਚ ਗੈਂਸਾ ਦੀ ਅਦਲਾ ਬਦਲੀ ਹੁੰਦੀ ਹੈ?
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no lungs helps in breathing so no exchange of gasses take place
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