The substance that provides immediate energy is adenosine triphosphate (ATP). ATP is called the energy currency of the cell, and is hydrolyzed to produce adenosine diphosphate and a phosphate group.
ATP is obtained by break down of carbohydrates, fats as well as proteins.
The liver stores a multitude of substances, including glucose, vitamin A, vitamin D<span />, vitamin B12,vitamin K, iron, and copper.
D. Smallpox is your answer
