All living organisms, from the smallest bacterium to the largest whale, share certain characteristics of life. For example, all living things are made of cells and they must reproduce to make the next generation. Without these characteristics, there is no life.
What is a cell?
In biology, the smallest unit can live on its own and that makes up all living organisms and the tissues of the body. A cell has three main parts: the cell membrane, the nucleus, and the cytoplasm. The cell membrane surrounds the cell and controls the substances that go into and out of the cell.
What are cells important?
Cells provide structure and function for all living things, from microorganisms to humans. Scientists consider them the smallest form of life. Cells house the biological machinery that makes the proteins, chemicals, and signals responsible for everything that happens inside our bodies.
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