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(also called the stele) the region that includes the pericycle and the vascular tissues in a plant stem.
biological classification group (taxon) for plants that are divided into classes.
the protective layer of fibrous connective tissue which surrounds each kidney.
cup-shaped sac at the beginning of the nephron, which surrounds the glomerulus.
rain that contains high levels of sulfuric acid, hydrochloric acid and nitric acid.