Based on the cell theory, which of the following is true?
all cells perform the same function.
all cells are of the same size and shape.
organisms can have only one or many cells.
cells vary in size depending on the size of the organism.

Cells vary in size depending on the size of the organism.

Based on the cell theory, organisms can have one or more cells and depending on the size of the organisms, the cells may vary in size.

Explanation:

The cell theory proposed by Robert Hooke confirmed that cells are the building blocks of every organisms. An organism can be made up of single cell and also with multiple cells.

The cells can have different size and shape depending upon the organism which it makes or where it is present. The functioning of the cells also differ based on the function of the organism.