Fact 1: Electricity sometimes is used for heating buildings.

Fact 2: Electrical energy is also energy.

Given the two facts above, answer the question "What is energy used for?" with the following options: 
- heating buildings
 - courtship
 - reversing time
 - Plants growth
 - Quality of life
 - to stay warm
 - destroying matter
 - teleportation


 

 heating buildings        