The term describes a condition in which the eye does not focus properly because of uneven curvatures of the cornea. a. nystagmus b. strabismus c. esotropia d. astigmatism

a time line cause it goes from 685 to 978

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.