The absence of living sperm in semen, which is a sign of infertility, is known as:

The term is called azoospermia. This condition can be treated depeding on its origin. It is commonly caused by infections in the male reproductive regions or sexually-transmitted diseases. If azoospermia is caused by genetics, only few to zero treatments are available. 

supercell thunderstorms are perhaps the most violent of all thunderstorm types, and are capable of producing damaging winds, large hail, and weak-to-violent tornadoes

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.