Question

which of the following is a principle of the cell theory? all existing cells are produced by non - living matter. organisms are composed of tissues only. all organisms are made of atoms. the cell is the most basic unit of life.

Explanation:

The cell theory has three main principles: all living organisms are composed of one or more cells, the cell is the basic unit of life, and all cells come from pre - existing cells. The first option is incorrect as cells come from pre - existing cells, not non - living matter. Organisms are composed of cells which can form tissues, but the statement about organisms being composed of tissues only is inaccurate. The statement about organisms being made of atoms is a general chemistry concept and not part of cell theory. The cell being the most basic unit of life is a principle of cell theory.

Answer:

The cell is the most basic unit of life.