Definition: 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.
Input: Evolution of which or no make that of what part of the immune system occurred in the evolutionary ancestor of jawed vertebrates?

Evolution of what part of the immune system occurred in the evolutionary ancestor of jawed vertebrates?