Question

question 1 - 10. a student observes that when a plant stem is cut, new cells form at the site of the cut. what principle of cell theory does this observation support? a. all organisms are made of cells. b. cells come from existing cells. c. cells contain genetic material. d. cells are the basic unit of life.

Explanation:

Cell theory has three main principles: cells are the basic unit of life, all organisms are made of cells, and cells come from existing cells. The observation of new cells forming at the site of a cut on a plant stem supports the principle that cells come from existing cells, as the new cells must originate from pre - existing cells in the plant.

Answer:

Cells come from existing cells.