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 type of behavior is most flexible? Answer: learned behavior

A: Learned behavior type of behavior is most flexible.
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Q: Question: Skeletal muscles must work in pairs to move bones back and forth at a joint because they can only do what? Answer: contract

A: Skeletal muscles must work in pairs to move bones back and forth at a joint because they can only contract.
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Q: Question: What state of matter takes neither the shape nor the volume of its container? Answer: solid

A:
Solid takes neither the shape nor the volume of its container.
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