correct answer: is c, decreasing the temperature.
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some mass changes into energy
some mass changes into energy are true about both nuclear fusion and nuclear fission. these both reactions produce large amounts of energy. nuclear fusion is the process in which two light nuclei combine to form a larger nucleus. on the other hand, nuclear fission is reverse in which a heavy nucleus breaks into two light nuclei. nuclear decay and transmission are also types of nuclear reactions. the matter is not destroyed in nuclear reactions.