How is a brain injury classified? a)as an injury of the peripheral nervous system b) as an injury of the central nervous system c) as an injury of the autonomic nervous system d) as an injury of the somatic nervous system

Brain injury classified as an injury of the central nervous system.  

Explanation:

CNS is made up of the brain and spinal cord therefore, Central nervous system injury is found in the brain and spinal cord. When some external injury causes damage directly to the central nervous system.  

An example is a coma it occurs when central nervous got a serious injury.

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.