Answer:
The answer would be "All living things are made of cells"..
Step-by-step explanation:
The three parts of the cell theory are:
A. All living things are composed of cells.
B. Cells are the basic units of structure and function for living things.
C. All cells come from pre-existing cells. Also, organisms grow by “adding on more cells” NOT by increasing the size of their cells.
I hope this might help you