1.) what is the most important source of energy that our body craves more than any other?
2.) what are the organelles in each cell that burn this energy?

1.) What is the most important source of energy that our body craves more than any other? 
Glucose is a type of sugar you would find in healthy fruits and vegetables. The body needs this to be active and full of energy. It starts as glucose, then gets turned into ATP.

2.) What are the organelles in each cell that burn this energy? 
Mitochondria, and cytoplasm.

From a high concentration to a low concentration.