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

Vesicles are basic tools of the cell for organizing metabolism, transport, and storage of molecules.
What are basic tools of the cell for organizing metabolism, transport, and storage of molecules?

Ice masses, acquifers, and the deep ocean are examples of water reservoirs.
Ice masses, acquifers, and the deep ocean are examples of water what?

Lakes do craters and rifts become when they fill with water.

What do craters and rifts become when they fill with water?