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.

[Q]: Question: Why is the life cycle of plants so complex? 
Answer: alternation of generation. 
Sentence: The life cycle of plants is so complex because of the alternation of generation.
[A]: Alternation of generation complicates the life cycle of plants.


[Q]: Question: Which kind of muscle regulates air flow in lungs? 
Answer: smooth. 
Sentence: Smooth muscle regulates air flow in lungs.
[A]: Air flow in lungs is regulated by smooth muscle.


[Q]: Question: How many times does Earth rotate on its axis in one day? 
Answer: once. 
Sentence: once many times does Earth rotate on its axis in one day.
[A]:
A 'day' is the amount of time the Earth rotates on its axis, which is once.


