The xylem is made from the xylem is made from elongated living cells intercellular spaces between cells tubular living cells dead, hollow cells

dead long hollow tubes.

Explanation:Because when xylem cells are first formed a chemical called lignin is deposited in spirals in the cell wall causing the cells to die and leave long hollow tubes which allow the movement of water and mineral ions through for healthy plant growth

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

yes we can.   a lady urinates from her urethra.