Which of the following is not one of the parts of the cell theory? A. All organisms are composed of one or more cells.
B. All cells come from preexisting cells.
C. Groups of cells form tissues and systems.
D. The cell is the basic unit of structure and organization

Yes

Explanation: All organism need energy to survive and carry out basic life functions. Mitochondria in these cells utilize ATP (which are energy molecules) to perform these functions. Even one cell can do this. ... These are all types of cell division that help categorize single-celled organisms as living organisms.