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: Where are aerofoils found? Answer: birds and airplanes

A: Birds and airplanes are aerofoils found.
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Q: Question: What is the term for daily cycles of behavior, like the sleep-wake cycle? Answer: circadian rhythms

A: Circadian rhythms is the term for daily cycles of behavior, like the sleep-wake cycle.
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Q: Question: What facilitates the diffusion of ions across a membrane? Answer: ion channels

A:
Ion channels facilitate(s) the diffusion of ions across a membrane.
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