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Answer» very high temperature and very high pressure low temperatureand high pressure high temperature and low pressure very high temperature and no pressure Solution :NUCLEAR fusion is a nuclear reaction in which two or more atomic nuclei COLLIDE at very high speed and join to form a NEW type of atomic nucleus (e. g. The energy that the Sum emits into space is produced by nuclear reactions that happen in its core DUE to the collision of hydrogen nuclei and the formation of helium nuclei). During this process, matter is not CONSERVED because some of the mass of the fusing nuclei is converted to photons which are released through a cycle that even our sun uses.
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