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

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

Rubber is an example of a(n) insulators that does not allow electrons to move through them.
Rubber is an example of what type of substances that do not allow electrons to move through them?

A vas deferens is the name of the tube that carries sperm from the epididymis to the urethra.
What is the name of the tube that carries sperm from the epididymis to the urethra?