Question 1. describe events that explain the border differences between these maps. (use the map
on the left to explain the events). use information from the maps and the lesson in your response.
use complete sentences.

4.a depression is the answer

True blindness may be caused by trauma to the eye, severe conjunctivitis due to  ibr (infectious bovine rhinoceros) or pink eye or other infections, leptospirosis, lead poisoning, selenium toxicity, fungal infections, vitamin a  deficiencies, rabies, vitamin b12 deficiency, neoplastic of the orbit or  conjunctiva, cataracts, congenital malformations, etc.