How does cell theory work

The cell theory establishes the fact that cells are crucial to life and so provides a base or foundation from which further elucidation of the cell is carried out. The cell theory is composed of six tenets which are:

1.All living organisms are composed of cells.

2. The cell is the basic unit of life.

3. Cells arise from pre-existing cells.

4. Energy flow occurs within cells

5. Heredity information is passed from cell to cell.

6. All cells have the same basic chemical composition.

The  cell theory forms part of the basic principles that are the foundation for the study of life.

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explanation:

"a.) well–developed vascular system."