Fact 1: An automobile engine transforms chemical energy into mechanical energy.

Fact 2: Chemical energy is the energy stored in molecules.

Given the two facts above, answer the question "Where is energy stored before being used by an automobile to create mechanical energy?" with the following options: 
- sunlight
 - layers of fat
 - The atmosphere
 - In molecules
 - fossil fuels
 - electrically
 - a hydraulic system
 - engines


 

    In molecules     