what are main characteristic that an organ must possess for functioning as a respiratory organ.
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These include the nose, pharynx, larynx, trachea, bronchi and lungs. The respiratory system does two very important things: it brings oxygen into our bodies, which we need for our cells to live and function properly; and it helps us get rid of carbon dioxide, which is a waste product of cellular function.
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digestive system is the correct answer please make my question as brain list
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