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

Input: Consider Input: Water contains 3 atoms.

Output: How many atoms does water contain?


Input: Consider Input: Interstitial fluid are all hormones secreted into before entering the circulatory system.

Output: Where are all hormones secreted into before entering the circulatory system?


Input: Consider Input: Trees need the vascular to transport nutrients.


Output: What system do trees need to transport nutrients?