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Given a scientific passage and an answer, generate a question for the given answer.

Passage: Internal energythe sum of the kinetic and potential energies of a system's atoms and molecules. Can be divided into many subcategories, such as thermal and chemical energy. Depends only on the state of a system (such as its P , V , and T ), not on how the energy entered the system. Change in internal energy is path independent. Answer: internal energy
Output:
The sum of the kinetic and potential energies of a system's atoms and molecules is called what?