In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

Q: Question: Which type of energy holds atoms together? Answer: bond energy

A: Bond energy holds atoms together.
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Q: Question: Which kind of muscle regulates air flow in lungs? Answer: smooth

A: Smooth muscle regulates air flow in lungs.
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Q: Question: What is a copy of an image formed by reflection or refraction? Answer: an image

A:
An image is a copy of an image formed by reflection or refraction.
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