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

Q: Starches are complex carbohydrates that are the polymers of glucose.

A: What complex carbohydrates are the polymers of glucose?
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Q: The sum of the masses of the atoms in the formula is referred to as molecular mass.

A: The sum of the masses of the atoms in the formula is referred to as what?
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Q: Transport epithelia are typically arranged into complex tubular networks with extensive surface areas.

A:
What are typically arranged into complex tubular networks with extensive surface areas?
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