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.

[EX 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
[EX A]: Skeletal muscles must work in pairs to move bones back and forth at a joint because they can only contract.

[EX Q]: Question: If the dna from all 46 chromosomes in a human cell nucleus was laid out end to end, it would measure approximately how long? Answer: two meters
[EX A]: If the dna from all 46 chromosomes in a human cell nucleus was laid out end to end, it would measure approximately two meters long.

[EX Q]: Question: The product of a wave's wavelength and its frequency is what? Answer: speed
[EX A]:
The product of a wave's wavelength and its frequency is its speed.