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: 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.


[Q]: Question: Which has a higher metabolic rate, a mouse or an elephant? Answer: mouse
[A]: Mouse has a higher metabolic rate, a mouse or an elephant.


[Q]: Question: Which of the following best explains why the pressure inside a high-flying airplane must be controlled? Answer: At high altitudes there is lower atmospheric pressure than on the surface of the Earth.
[A]:
At high altitudes there is lower atmospheric pressure than on the surface of the earth of the following best explains why the pressure inside a high-flying airplane must be controlled.