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a pure substance made of only one type of atom. An element cannot be broken down into simpler substances.
an area of land which is usually covered with shallow water, and which supports plants adapted...
a duct through which saliva passes from the salivary gland into the mouth.
cells that are formed during secondary growth by the vascular cambium ring just to the outside...
when a plant cell loses water and the cell membrane pulls away from cell wall.