Given a scientific passage and an answer, generate a question for the given answer.

Passage: To this point, we have examined the relationships between any two of the variables of , , and , while the third variable is held constant. However, situations arise where all three variables change. The combined gas law expresses the relationship between the pressure, volume, and absolute temperature of a fixed amount of gas. For a combined gas law problem, only the amount of gas is held constant. Answer: pressure
The combined gas law involves three properties of a gas - volume, absolute temperature, and what?

Passage: Adulthood is divided into the stages of early, middle, and late adulthood. Answer: three
Adulthood is divided into how many stages?

Passage: In benzene, the true bonding between carbon atoms is neither a single nor a double bond. Rather, all of the bonds are a hybrid of a single and double bond. In benzene, the pi bonding electrons are free to move completely around the ring. Delocalized electrons are electrons that are not confined to the bond between two atoms, but are instead allowed to move between three or more. The delocalization of the electrons in benzene can best be shown by showing benzene with a ring inside the hexagon, with the hydrogen atoms understood. Answer: delocalized
What type of electrons are electrons that are not confined to the bond between two atoms?