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the tube that carries urine from the nephrons to the ureter via the renal pelvis.
bacteria that convert nitrogen in the air into compounds such as nitrites, nitrates and ammonia...
a thin hairlike outgrowth of an epidermal cell of a plant root that increases the surface area...
an organ system that passes nutrients, gases, hormones, blood cells, etc. to and from cells in...
a thick layer inside the primary cell wall. It consists mainly of cellulose, hemicellulose and...