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

Chordates include vertebrates and invertebrates that have a notochord.
Chordates include vertebrates and invertebrates that have what?

A student should use a balance to compare the masses of two small rocks.
Which tool should a student use to compare the masses of two small rocks?

Filtration is the movement of fluid out of the capillaries.

What is the movement of fluid out of the capillaries called?