The correct statements which are true for the reactions in the Sun are that are fusion reactions and reactions occur because of very high temperatures.
What is nuclear fusion?
Nuclear fusion reactions are those reactions in which two species reacts with each other for the formation of new specie.
In the core of the sun, nuclear fusion of hydrogen atoms occur for the formation of helium molecules in the presence of high temperature.
Hence, the correct statements are they are fusion reactions and reactions occur because of very high temperatures.
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