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

Digestion begins in the gastrovascular cavity.
Where does digestion begin?

Mechanical waves term describes waves that travel through matter.
What term describes waves that travel through matter?

During the anaphase phase, sister chromatids separate and the centromeres divide.

During which phase do sister chromatids separate and the centromeres divide?