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Cell

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The basic unit of life. All living things are made of cells, and they carry out all the functions needed to stay alive.

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Unicellular

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An organism made up of only one cell. Examples include bacteria and amoebas.

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Multicellular

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An organism made up of many cells that work together. Humans, animals, and plants are multicellular.

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Prokaryotic Cells

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Simple cells that do not have a nucleus or other membrane-bound organelles. Bacteria are made of prokaryotic cells.

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Eukaryotic Cells

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More complex cells that have a nucleus and other organelles. Plants, animals, fungi, and protists are made of eukaryotic cells.

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Homeostasis

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The process by which living things keep their internal environment stable, even when the outside environment changes. For example, humans sweat to cool down and shiver to warm up, helping to maintain a steady body temperature.

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DNA

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The material inside cells that carries genetic information. It tells the cell how to grow, develop, and function.

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Cell Theory

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A scientific idea that says all living things are made of cells, cells are the basic units of life, and new cells come from existing cells.