Given a statement, generate a question such that the answer is contained in that statement.

Q: Many seeds can wait to sprout until conditions are better for growth.

A: What can many seeds wait until conditions are better for growth?
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Q: Sensation is caused by sensory nerve cells

A: What causes Sensation?
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Q: an optical system is used for observing stars by researchers

A:
What is used for observing stars by researchers?
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