Which features at the ends of xylem vessel elements permit a continuous flow of water? Select all that apply.
End walls may be absent, leaving an open passage.✓پاسخ درست
Every end is closed by an impermeable wall.
Perforations allow water to pass between elements.✓پاسخ درست
Solid plugs seal the hollow interiors apart.
توضیح
Missing end walls or end walls with openings let water pass from one vessel element to the next with little obstruction. Intact sealed barriers would interrupt the internal route rather than support continuous flow.