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A cell is the smallest structural and functional unit of an organism and typically microscopic. Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. Cells also contain the body’s hereditary material and can make copies of themselves.
Cells have many parts, each with a different function. These parts are called organelles that are specialized structures that perform certain tasks within the cell. The collection of organelles in a cell must be able to perform all of life's functions.