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: Only animals have muscle tissue and what other type of tissue? Answer: nervous

A: Only animals have muscle tissue and nervous tissue.
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Q: Question: What kind of lines does a diffraction grating produce? Answer: evenly spaced lines

A: Evenly spaced lines kind of lines does a diffraction grating produce.
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Q: Question: A penguin must do what before molting? Answer: increase muscle mass

A:
A penguin must do increase muscle mass before molting.
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