Energy
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ATP plus H2O release energy (endergonic reaction) and P. Now, this P plus ADP becomes ATP (exergonic reaction). It's a cyclic process. It starts all over again at ATP plus H2O..
In biology, ADP refers to adenine diphosphate, where adenosine is connected with two highly energized phosphate molecules. When another phosphate (P) is connected, it forms ATP, or adenosine triphosphate. This is the primary form of energy that we use.