You are presented with the question "What works by summing kinetic energy and potential energy?" and the following answer choices: 
- Riding a bike
 - transportation technology
 - adding heat
 - an automobile engine
 - circulatory systems
 - a hydraulic system
 - Thyroid-stimulating hormone
 - heterotrophs

Now knowing that an automobile engine transforms chemical energy into mechanical energy and mechanical energy is the sum of Kinetic Energy and Potential Energy, choose the best answer.


 

    an automobile engine     