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

Microevolution is the process by which organisms change in small ways over time.
What is the process by which organisms change in small ways over time?

Solid is characterized by molecules with minimal movement and strong forces between them.
Which state of matter is characterized by molecules with minimal movement and strong forces between them?

When a fluorine atom gains an electron, it becomes a negative fluoride ion.
When a fluorine atom gains an electron, it becomes a negative what?