potential energy , kinetic energy , organisms, interactions, matter, ecosystmes, stuff, chemical reactions, energy, physical changes, structures, functions, chemical changes, characteristics, mass, velocity, thermal energy , heat, temperatures, changes,

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เช†เชชเซ‹เช†เชช เชธเช‚เช—เซเชฐเชน เชฅเชฏเซ‡เชฒ เช›เซ‡: ?