Concept:The cell membrane is a thin, flexible boundary present in all living cells.
Explanation:Plant cells have a cellulose cell wall, chlorophyll, and a large central vacuole.
Animal cells lack a cellulose cell wall, chlorophyll, and a large central vacuole.
Both plant and animal cells possess a cell membrane that encloses the cytoplasm.
The cell membrane controls the movement of substances into and out of the cell.
Among the given options, the cell membrane is the only structure common to both cell types.
Answer:C. Cell membrane