Within the core of the Sun, temperatures and pressures are high enough to fuse hydrogen atoms into helium, which is the Sun's main form of energy production. Assuming there was a slight mistake in where you have copied the results here the correct answer is the third option.
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Protons and neutrons.
Note: They probably are ABOUT the same mass. Don't think they are exactly the same.
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Answer:
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The answer is D.timber good luck
Electrons and protons because they are essentially always the same