Final answer:
Mitochondria are responsible for converting proteins, carbs, and fats into energy through cellular respiration.
Step-by-step explanation:
The highly organized cellular organelles responsible for converting proteins, carbs, and fats into energy are the mitochondria. Mitochondria are often called the "powerhouses" or "energy factories" of the cell because they produce adenosine triphosphate (ATP), which is the main energy-carrying molecule in cells. Through cellular respiration, mitochondria use oxygen to produce ATP from nutrients like glucose.