Summarize the four concepts collectively known as the "cell theory"

Cell Theory is the scientific theory by Schleiden and Schwann which states that all living organisms are made up of cells and that they have structures and come from previously existing cell.

The four concepts of the cell theory are:

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1. All living organisms are composed of one or more cells.

2. The cell is the basic unit of structure and organization in organisms.

3. Cells arise from pre-existing cells.

4. All cells maintain homeostatis.

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