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Have you ever visited a zoo? There you can see huge elephants, tall giraffes, comical monkeys, strange birds and many other animals. The animals in the different cages look so different that you must surely believe that they can have little in common.
Yet, all living things actually do have something in common. They are all made of tiny units called cells. The huge elephant is made of hundreds of billions of cells, and there little animals whose whole body is formed of a single cell. The human body, too is made of cells - billions of them.
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