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5.2: Introduction to Cell Theory

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    What you’ll learn to do: State the basic principles of the unified cell theory

    A cell is the smallest unit of a living thing. A living thing, whether made of one cell (like bacteria) or many cells (like a human), is called an organism. Thus, cells are the basic building blocks of all organisms. In this outcome we will learn about the discovery and origin of cells.

    Thumbnail for the embedded element "Cell theory | Structure of a cell | Biology | Khan Academy"

    A YouTube element has been excluded from this version of the text. You can view it online here: pb.libretexts.org/bionm1/?p=156

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