instruction:
Given a scientific passage and an answer, generate a question for the given answer.
question:
Passage: Transcription takes place in three steps: initiation, elongation, and termination. The steps are illustrated in Figure below . Answer: transcription
answer:
Initiation, elongation, and termination are the three steps of what?

question:
Passage: 16.3 Circulatory and Respiratory Systems Animal respiratory systems are designed to facilitate gas exchange. In mammals, air is warmed and humidified in the nasal cavity. Air then travels down the pharynx and larynx, through the trachea, and into the lungs. In the lungs, air passes. Answer: nasal cavity
answer:
In mammals, air is warmed and humidified in what?

question:
Passage: Most people think of opossums as scary creatures. Is this because they look kind of funny, walk kind of funny, have beady eyes and sharp teeth, and can emit a very foul odor? Maybe. But what is so different about opossums is that they are the only marsupial in North America. Answer: oppossum
answer:
What is the only marsupial in north america?