Here's why:
* Xylem is a type of vascular tissue in plants, responsible for transporting water and dissolved minerals upwards from the roots to the rest of the plant.
* Xylem vessels are long, hollow tubes made up of dead cells that are joined end-to-end. Their cell walls are thickened and strengthened with lignin, giving them the rigidity to carry water against gravity.
Let me know if you have any more questions!