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found in the cell wall of xylem cells where the secondary cell wall is absent but the primary cell wall is present. They allow lateral movement of water within the plant.
the hormone produced by the beta cells of the Islets of Langerhans in the pancreas, which...
a muscular structure on the floor of the mouth of most vertebrates, which manipulates food for ...
an atom or a group of atoms that has gained or lost one or more electrons and so has an electric...