Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Q: Pyramid ecosystem is used to show energy flow through the trophic levels.

A: What is used to show energy flow through the trophic levels?
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Q: Over 90% of the energy we use comes originally from the sun.

A: Over 90% of the energy we use comes originally from what?
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Q: Compared with the molecules of many other substances, molecules of water are strongly attracted to each other.

A:
Compared with the molecules of many other substances, molecules of water are strongly attracted to what?
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