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

Ex Input:
The seven unique crystal types are defined by faces parts of themselves (parts that intersect at various angles).

Ex Output:
The seven unique crystal types are defined by what parts of themselves (parts that intersect at various angles)?


Ex Input:
A skeleton that consists of hard, mineralized structures located within the soft tissue of organisms is called endoskeleton.

Ex Output:
A skeleton that consists of hard, mineralized structures located within the soft tissue of organisms is called what?


Ex Input:
Eukaryotic cell division involves mitosis and cytokinesis.

Ex Output:

Eukaryotic cell division involves mitosis and what?