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The external nose is composed of cartilaginous tissue not unlike bone, but far more flexible in composition. This is because your nasal passages need to be able to expand and contract in response to changing environmental conditions such as heat, moisture and wind, as well as mucus production or physical injury. We are actually designed to breathe through our nose whenever possible, because the extra few moments before the air reaches our lungs allows cold air to warm up, hot air to cool down and dirty or polluted air to be scrubbed clean by our nasal hairs and mucus membranes. Breathing through your mouth leads to various medical issues if overdone, so it's fortunate that our noses are so flexible or anyone living in cold/very wet conditions year-round would be in trouble!

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