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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.
when a plant cell loses water and the cell membrane pulls away from cell wall.
fats that are liquid at room temperature. They are found in plants.
the cartilaginous flap at the top of the mammalian trachea, which closes off the entrance to the...
an atmospheric gas made of three oxygen molecules bonded together (O3).