1.

Which one of the following is a possibility for most of us in regards to breathing, by making a conscious effortA. One can consciously breathe in and breathe out by moving the diaphragm alone, without moving the ribs at allB. The lungs can be made fully empty by forcefully breathing out all air from themC. One can breathe out air totally without oxygenD. One can breathe out air through eustachian tubes by closing both the nose and the mouth

Answer» Correct Answer - d


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