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The size of an organism usually depends more on the total number of cells it has and not as much on the size of the cells.

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DNA represents a set of instructions that guides the cell. These instructions determine what the cell makes, what it needs, and when it should divide.

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Each new cell is produced from an existing cell, so cells are reproduced by dividing.

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The genetic material is a chemical substance called DNA (deoxyribonucleic acid).

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is a semipermeable membrane that controls what goes in and out of the cell.

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All cells have a covering called a membrane.

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It would take about 40,000 of your red blood cells to fill this letter O.

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The human body has more than 10 trillion (10,000,000,000,000) cells.

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The smallest structural and functional unit of an organism. Cell is the basic unit of life.