What is ozone and how does it affect any ecosystem?

Explanation

Ozone (`O_3`) is a molecule, made up of three atoms of oxygen.
Ozone (`O_3`) forms a layer in the upper atmosphere. It is very essential for the life on this planet. It shields the surface of the earth from ultra-violet radiation (UV) coming from sun as these radiations are very harmful causing skin cancer and cataract in humans. It also does harm to the crops.