Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
--------
Question: Glaciers deposit their sediment when they melt.

Answer: When do glaciers deposit their sediment?


Question: A 50 ml graduated cylinder of the following tools would give the most precise measurement of 15 milliliters of water.

Answer: Which of the following tools would give the most precise measurement of 15 milliliters of water?


Question: The lungs of mammals are unique in having alveoli.

Answer:
The lungs of mammals are unique in having what?