Given a scientific passage and an answer, generate a question for the given answer.

Input: Consider Input: Passage: boundary between air masses that is stalled in one place. Answer: aids

Output: Opportunistic diseases are usually the direct cause of death of people with what disease?

Input: Consider Input: Passage: Regulation of transcription in prokaryotes typically involves operons. An operon is a region of DNA that consists of one or more genes that encode the proteins needed for a specific function. The operon also includes a promoter and an operator. The operator is a region of the operon where regulatory proteins bind. It is located near the promoter and helps regulate transcription of the operon genes. Answer: operon

Output: Which region of dna consists of one or more genes that encode the proteins needed for a specific function?

Input: Consider Input: Passage: An ecosystem consists of all the living things in a given area, together with the nonliving environment. The nonliving environment includes water, sunlight, and other physical factors. Answer: ecosystem
Output: All of the living things in an area and the nonliving environment together make up what?