Which of the following gases is needed for the breakdown of digested food :-
(a) nitrogen (b) carbon-di -oxide (c) oxygen
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Answer:Intestinal gas is composed of various amounts of oxygen, nitrogen, carbon dioxide, hydrogen, and methane. Oxygen, nitrogen, and carbon dioxide come from swallowed air and hydrogen and methane are by-products of the breakdown of food residue by good bacteria (probiotics) naturally residing in the colon
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(b) carbon dioxide
is the correct option
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