Which of the following is true about the cell theory?

A. All life functions occur within some cells.

B. All organisms are multicellular.

C. All cells have a nucleus to control the cell's activities.

D. All cells must be reproduced by another cell.

D. All cells must be reproduced by another cell.

Explanation:

The cell theory has a couple key components, which are as follows:

#1. Cells are the basic unit of life.

#2. Cells have hereditary data that is passed down to their offspring.

#3. All cells come from preexisting cells.

#4. All organisms, both unicellular and multicellular, are made of one or more cells.

#5. Energy flows through cells.

#6. All cells have a similar composition.