Vacuole
Vacuoles are found in both plants and animals in the cell mambrane. They are enclosed compartments filled with water with inorganic and organic molecules. The function varies greatley to what type of cell it is. They help the cell fufill its purpose in any type of cell. (http://www.princeton.edu/~achaney/tmve/wiki100k/docs/Vacuole.html)
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http://upload.wikimedia.org/wikipedia/commons/thumb/e/e0/Biological_cell_vacuole.svg/2000px-Biological_cell_vacuole.svg.png
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