GED Science Practice Test: Cell Theory

All living organisms are made up of at least one cell. Many living organisms are made up of millions of cells (like humans). Most cells are very small in size, meaning that they are too small to be seen with the naked eye and must be viewed using a microscope.

While cells vary significantly in shape, size, and function, there are some statements that apply to all cells and all living organisms. Three key statements, outlined below, comprise what biologists call the “cell theory:”

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