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

Q: A theory is another name for a broad explanation that is supported by a great deal of evidence.

A: What is another name for a broad explanation that is supported by a great deal of evidence?
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Q: Humans have 23 pairs pairs of chromosomes.

A: How many pairs of chromosomes do human have ?
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Q: Oxygen group is group 16 of the periodic table referred to.

A:
What is group 16 of the periodic table referred to?
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