They all keep the plant alive and healthy! rawr XD
Answer:
Hair cells are present inside the inner ear that acts as a receptor of sound. Researchers affirmed that once there is a damage to the hair cell, it can regenerate in birds.
Damage hair cell can lead to loud noise which in turn affect the ear. The supporting cells are present along with the hair cells. When the hair cells get damaged, the supporting hair cell gets the signal to start the process of regeneration.
The nucleus!
Hope this helps.
The placenta produces hormones to help the baby stay healthy and grow it also fights bacteria in the womb
Layer D is the oldest because bottom layers form first and are covered by new rock layers.