द फिजिकल फ्रॉक्स प्रोसेस ऑफ एक्सचेंज आफ गैसेस विद द सराउंडिंग इस कॉल्ड
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Answer:
diffusion of gases
Explanation:
the diffusion of gases from the area of a higher concentration two and area of lower concentration especially the the exchange of Oxygen and Carbon dioxide
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