Given a scientific question, generate a correct answer to it.

Ex Input:
What kind of bonds are there between carbon atoms in saturated fatty acids?

Ex Output:
single

Ex Input:
Potential differences from various voltage sources are necessary in order to create electrical fields, which result in what flow of charge?

Ex Output:
current

Ex Input:
What must people with type 1 and type 2 diabetes frequently check?

Ex Output:
blood glucose levels