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

Input: Consider Input: According to the english system measurement, 4 cups much is equal to 2 pints, 1 quart, and ¼ of a gallon.

Output: According to the english system measurement, how much is equal to 2 pints, 1 quart, and ¼ of a gallon?


Input: Consider Input: The bird ancestor that lived in trees developed wings, which is commonly associated with birds.

Output: The bird ancestor that lived in trees developed what feature commonly associated with birds?


Input: Consider Input: Gas bubble holes helps pumice float in water.


Output: What helps pumice float in water?