Which characteristics of companion cells and xylem vessel elements enable them to carry out their functions effectively?
- Acompanion cells: transport contents of cell in one direction only; xylem vessel elements: lignified walls provide support
- Bcompanion cells: cellulose walls provide support; xylem vessel elements: nuclei allow cell division
- Ccompanion cells: nuclei allow cell division; xylem vessel elements: gaps between cells allow rapid transport
- Dcompanion cells: numerous mitochondria supply energy; xylem vessel elements: absence of cytoplasm allows mass flow