Cells are the building blocks of life. All organisms are built out of cells. Many cells can do things such as remove waste, use and produce energy, such as red blood cells that are in our bodies, or cells that cover mushrooms.
Our eyes are not strong enough to see the small cells in living things; instead, we use Microscopes to see things with a closer lens. Organisms that are built out of many cells are multicellular, while single-celled organisms are unicellular.
An example of a unicellular organism is the E. coli bacteria. By itself, it is made to reproduce, make and use energy, and take in nutrients, and multicellular organisms use many cells to carry out their procedures.
All cells come from other cells, meaning that they are created or reproduced by cells.
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