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

Input: Consider Input: Bile acids, needed to emulsify lipids, are stored in the body in the gallbladder.

Output: Where are bile acids, needed to emulsify lipids, stored in the body?

Input: Consider Input: Negative growth rate results when birth rates fall even lower than death rates.

Output: What results when birth rates fall even lower than death rates?

Input: Consider Input: Are humans a new or old species on the earth?
Output: Are humans a new or old species on the earth?