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The cell membrane, the cytoplasm, and the nucleus of all cells are made of a material called protoplasm. Protoplasm is a living material and makes a living cell alive. Scientists have found protoplasm to be made of water and many other chemical substances. Although scientists know what these substances are and how much of each there is in protoplasm, no scientist thus far has been able to put them together properly so as to make living protoplasm. This shows that protoplasm is a very complex material.
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