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 sources of energy in the body are carbohydrates, proteins, and fats, being burned in the presence of oxygen. But the chemical reactions required to consume this energy do â¦require water, and in fact produce water and carbon dioxide as byproducts.