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the osmotic pressure that develops within the cells of a root system that causes the sap to rise up through a plant stem to the leaves.
bacteria that convert nitrogen in the air into compounds such as nitrites, nitrates and ammonia...
thin-walled or slightly strengthened, elongated phloem cells that conduct food substances.
a hormone produced by the pituitary gland, which helps to limit the amount of water lost from...
the region of the kidney where the renal artery enters, and where the renal vein and the ureter...