Adisease involving a virus that attacks the nervous system and often results in paralysis is:

poliomyelitis
arthritis
conjunctivitis
bursitis

Your answer is going to be a. i know my biology

It is called the medulla oblongata or people usually call it medulla. it is the lower half of the brain stem continuous with the spinal cord. 

Leaves specifically the gas exchange between plants and the environment. while plants undergo photosynthesis, they also partake in cellular respiration. respiration is the process that happens in the leaves of plants.