Cells are the building blocks of all living things. A cell is the smallest part of a living thing that carries out actions that keep the thing alive. Some living things are made of only one cell-they are unicellular. People are multicellular. The human body is made of more than one hundred trillion cells.
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Cells are the building blocks of all living things. A cell is the smallest part of a living thing that carries out actions that keep the thing alive. Some living things are made of only one cell-they are unicellular. People are multicellular. The human body is made of more than one hundred trillion cells.