what are the disadvantage of lower jaw
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The original selective advantage offered by the jaw may not be related to feeding, but rather to increased respiration efficiency. Many teleost fish have substantially modified jaws for suction feeding and jaw protrusion, resulting in highly complex jaws with dozens of bones involved.
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there are two types of jaw lower jaw and upper jaw lower jaw is movable that's why we are able to talk and can take food if the lower jaw is non movable then we will not be able to talk or take food or anything which are done from the mouth you will not be able to do that so this is only the disadvantage of lower jaw
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