Opal is considered the birthstone for people born in October. Famous opals. The Olympic Australis, the world's largest and most valuable gem opal [citation needed], found in Coober Pedy; The Andamooka Opal, presented to Queen Elizabeth II, also known as the Queen's Opal
1 Carbohydrates â are required for energy. 2  Glucose, which is a monosaccharide, is the most essential source of energy in the body. 3  The brain works entirely on glucose alone. 4  When an immediate source of energy is required, glucose is converted into glycogen which is stored in the liver.
These are the 6 Essential Nutrients your body needs daily: 1. Proteins â they make up most of the cell structure including the cell membrane. Genetic information in the cell is stored as Protein in the form of DNA. All the enzymes, that catalyze metabolic reactions in the human body, are protein in nature.