Cellular respiration is the process by which organisms use oxygen to break down food molecules to get chemical energy for cell functions.
Krebs Cycle: the sequence of reactions by which most living cells generate energy during the process of cellular respiration. It takes place in the mitochondria, consuming oxygen, producing carbon dioxide and water as waste products, and converting ADP to energy-rich ATP.
Electron carriers are reduced during glycolysis and Krebs cycle to NADH + H+ and FADH2. These carriers then donate electrons and protons to the electron carrier proteins of the electron transport chain. The final electron acceptor is oxygen. Together with oxygen, electrons and protons form molecules of water.
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Metamorphic rocks are formed from other rocks that are changed because of heat or pressure. They are not made from molten rock – rocks that do melt form igneous rocks instead. ... They do not melt, but the minerals they contain are changed chemically, forming metamorphic rocks.
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It is commensalism since it benefits the species and leaves the other unharmed.