Marine Corps Physical Fitness Test. Fitness is essential to the day-to-day effectiveness and combat readiness of the Marine Corps. The Marine Corps considers physical fitness an indispensable aspect of leadership.
A: Chemical energy is for producing heat in the human body to sustain vital functions, converting solar energy in plants through photosynthesis, producing electrical energy in batteries to power devices and burning fossil fuels in combustion engines to produce heat or motion.
The human body generates energy from the natural glucose in starches and carbohydrates or from the ketones that are found in fat. When you limit your intake of any source of nutrition, your body will resort to whatever means necessary to provide fuel.