instruction:
Convert a disfluent question to a proper question. A disfluent question is a question that has some interruptions in it while framing. A proper question is the correct form of the question without any disfluency.
question:
How can any branch be a field of F no um knot?
answer:
How can any knot be a field of F?


question:
Which species rather what happens to plankton when they mature?
answer:
What happens to plankton when they mature?


question:
What causes elevated hormone levels, well vitamin D levels in the elderly?
answer:

What causes elevated vitamin D levels in the elderly?