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

Unicellular eukaryotes are protists normally.
What type of eukaryotes are protists normally?

Muscle groups are controlled by the motor cortex .
Muscle groups are controlled by what mechanism?

A neutron collides with an atom of u-235 during the basic nuclear fission process.

What type of particle collides with an atom of u-235 during the basic nuclear fission process?