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Category:Respiratory systemThe respiratory system is the biological system of any organism that engages in gas exchange. Even trees have respiratory systems, taking in carbon dioxide and emitting oxygen. SubcategoriesAdditional recommended knowledgeThere is one subcategory in this category, which is shown below. HPages in category "Respiratory system"There are 40 pages in this section of this category.
Categories: Organ systems | Respiration |
