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.
Explain how vitamins play a role in cellular metabolism. Answer: Vitamins are important coenzymes that help enzymes carry out many cellular functions. One of the most common misconceptions about cellular respiration is that we inhale oxygen and that this oxygen is converted to carbon dioxide, which we exhale. Explain what happens to the oxygen we inhale during cellular respiration. Then explain where the carbon dioxide we exhale comes from in cellular respiration. Answer: The oxygen is used to produce ATP from the food we eat by accepting electrons at the end of the electron transport chain and eventually is converted to water.