Valleys are one of the most common landforms on the surface of the planet. They are carved by flowing water or flowing ice through the process of erosion, which is the gradual wearing away of Earth surfaces through the action of wind and water.
The cellular respiration processes of all living cells make use of the coenzyme Nicotinamide adenine dinucleotide (NAD). It plays a key role in energy metabolism by accepting and donating electrons.
NIACIN-B3 Chief Functions in the Body: Part of coenzymes NAD (nicotinamide adenine dinucleotide) and NADP (its phosphate form) used in energy metabolism. BIOTIN Chief Functions in the Body: Part of a coenzyme used in energy metabolism, fat synthesis, amino acid metabolism, and glycogen synthesis.