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?

Cancer occurs most often in adults over fifty age.
Cancer occurs most often in adults over what age?

Unpolarized light type of light is composed of many rays having random polarization directions.

What type of light is composed of many rays having random polarization directions?