How many of the following statements are correct? A. O2 is utilised by the organisms to indirect....

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How many of the following statements are correct?
A. O2 is utilised by the organisms to indirectly break down nutrient molecules.
B. Process of exchange of CO2 from the atmosphere with O2 produced by the cells is called breathing.
C. Mammals have an well developed respiratory system.
D. We have a pair of external nostrils, which opens out side above the upper lips. 📲PW App Link - https://bit.ly/YTAI_PWAP 🌐PW Website - https://www.pw.live



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