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the tube through which urine passes from the bladder to the exterior.
the inner region of the kidney, striped in appearance, made up of renal pyramids.
allergic reaction to certain allergens such as pollen. It causes sneezing, a runny nose and...
(also called pith rays) sections of the medulla that occur between the vascular bundles.
rain that contains high levels of sulfuric acid, hydrochloric acid and nitric acid.