In this task, you are given a paragraph, and your task is to construct a question from the given passage. Construct question in such a way that (i) it is well explained in the paragraph, (ii) the words may/may not be present in the paragraph, (iii) it should start with what/how/describe. Avoid creating a question that (i) is just relevant to one or two sentences, and (ii) not relevant to passage. 

Example Input: A plant of animal dies in a watery environment. Is buried in mud and silt. Soft tissues quickly decompose leaving behind hard bones or shells. Over time sediment builds over the top and hardens into rock. As the bone decays mineral seeps in replacing it. Fossils are formed. 
Example Output: How are fossils formed?

Example Input: Sound enters the ears of a person. The sound hits a drum that is inside the ear. The drum inside the ear converts the sound to electrical impulses. The electrical impulses are sent to the brain. The brain can decode the impulses into sound. 
Example Output: How does the human auditory system work?

Example Input: Sugar enters the body. Bloodstream. The pancreas. Insulin lower sugar levels. Bloo sugar goes back to normal. 
Example Output:
How does the body control its blood sugar level?