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

Ex Input:
The location of an object in a frame of reference is called position.

Ex Output:
The location of an object in a frame of reference is called what?


Ex Input:
A(n) an ionic bond forms when the metal sodium gives up an electron to the nonmetal chlorine.

Ex Output:
What forms when the metal sodium gives up an electron to the nonmetal chlorine?


Ex Input:
Echinoderms lack centralized nervous system type of system that in humans consists of the brain and spinal cord.

Ex Output:

Echinoderms lack what type of system that in humans consists of the brain and spinal cord?