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Waveform Audio File Format  |  1995-06-29  |  462.3 KB  |  1 channel  |  22,050 sample rate  |  42 seconds  |  [TEXT/LMAN]
Transcription: Cells are the building blocks of living things, as bricks are of houses. Larger organisms, such as human beings, are made of billions of cells. Each cell is a tiny living unit that is too small to be seen without a microscope. Cells usually have three main parts. The cell membrane, outer skin, controls what goes in and out of the cell. The cytoplasm is the area where most of the cell's reaction take place, such as the release of energy by the mitochondria. The nucleus controls all the cell's activities. Different cells do different jobs. This affects their structure.