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   ocr: CELLS - ELLSare the building blocks membrane (outer "skin") controls Cotiringt things, as bricks are what goes in and out ofthe cell. The ofhouses. Larger organisms, such as cytoplasm is the area where most of the human beings, are made ofbillions of cell's reactions take place, such as the cells. Each cell is a tiny living unit that release of energy by the mitochondria. ist too small to be seen without a The nucleus controls all the cell's microscope. Cells usually activities. Different cells do have three main different jobs; this affects parts. The cell their structure. Animalcell Nucleus ...