Question

what does the cell theory state?
all cells can replicate a predetermined number of times.
all cells are capable of diffusion, facilitated transport, and active transport.
all cells come from existing cells.
all living things are made of cells.
all cells contain organelles.

Explanation:

Cell theory has three main tenets: all living organisms are composed of one or more cells; the cell is the basic unit of structure and function in living things; and all cells arise from pre-existing cells. The options "All cells come from existing cells" and "All living things are made of cells" directly align with these tenets. Other options are incorrect: cell replication limits (Hayflick limit) are not part of cell theory; not all cells perform all transport types (e.g., prokaryotes lack some mechanisms); prokaryotes have no membrane-bound organelles.

Answer:

C. All cells come from existing cells., D. All living things are made of cells.