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

Cranium (skull) is the term for the skeletal structure of the head that supports the face and protects the brain.
What is the term for the skeletal structure of the head that supports the face and protects the brain?

Electron transport is the final stage of aerobic respiration, when energy from the krebs cycle is transferred to atp.
What is the final stage of aerobic respiration, when energy from the krebs cycle is transferred to atp?

Proper chemical formulas for ionic compounds balance the total positive charge with total negative charge.

Proper chemical formulas for ionic compounds balance the total positive charge with what?