TASK DEFINITION: You are given a question, its answer, and a sentence that supports the question, i.e., the answer to the question is inferable from the sentence. In this task, you need to paraphrase the given sentence so that the paraphrased sentence still supports the question i.e. you can still infer the answer to the question from the paraphrased sentence. Do not write a paraphrase with a minor change in the given sentence e.g. replacing the word "one" with "a". Instead, try to write a paraphrase that contains new words, i.e. the words that are not present in the input sentence.
PROBLEM: Question: Each species has a particular way of making a living which is called its what? 
Answer: niche. 
Sentence: Each species has a particular way of making a living, which is called its niche.

SOLUTION: A nice is the particular way a species makes a living.

PROBLEM: Question: In weather terms, what do you call the boundary between two air masses? 
Answer: front. 
Sentence: In weather terms, the boundary between two air masses is called front.

SOLUTION: A front is the boundary between two air masses in weather terms.

PROBLEM: Question: Which kind of muscle regulates air flow in lungs? 
Answer: smooth. 
Sentence: Smooth muscle regulates air flow in lungs.

SOLUTION:
Air flow in lungs is regulated by smooth muscle.

