The xylem is made from dead, hollow cells. <span> Tracheids and vessel elements are the main components of xylem witch have a function to transport water. Those are elongated dead cells at maturity (without protoplast) with a thick, strengthened cellulose cell wall and a hollow lumen. Even though they are dead they still maintain a function, because are being protected by surrounding living cells.</span>
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
The vestibulocochlear nerve mediates hearing and balance. Hearing can be assessed with a 512-Hz tuning fork. The Rinne and Weber tests are commonly used to assess for sensorineural and conductive deafness.
