Energy is used for heating a building by a heating system.
Sometimes, in a cold climate it is necessary to use heat, but use only slow heat.
Humans use energy when living in a cold climate.
What do humans use when living in a cold climate?
(a) energy
(b) spaceships
(c) hair
(d) freezers
(e) weapons
(f) fur
(g) Blankets
(h) chemicals