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: What do muscles need to contract? Answer: stimulus

A: Muscles need stimulus to contract.
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Q: Question: Saturn is made mostly of helium and what else? Answer: hydrogen

A: Saturn is made mostly of helium and hydrogen.
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Q: Question: What is the name for a matter that has a fixed volume and a fixed shape? Answer: solid

A:
The name for a matter that has a fixed volume and a fixed shape is solid.
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