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.
Coenzymes do what their name impliesâthey are co-workers (or cofactors) in helping enzymes do their jobs. A lot of coenzymes are derived from vitamins. For example, the coenzyme derived from vitamin B1 is a long scientific sounding word weâll shorten to TPP.