* Mechanical energy: Used for movement, such as walking, running, and lifting objects.
* Thermal energy: Used to maintain body temperature.
* Electrical energy: Used for nerve impulses and muscle contractions.
* Chemical energy: Used for building and repairing tissues, and for other metabolic processes.
However, the body cannot directly convert chemical energy in food into light energy.
Therefore, the answer is light energy.
While some organisms, like fireflies, can produce light through a chemical reaction called bioluminescence, humans cannot.
