The correct statement about nuclear fusion is the last one: "it produces nearly all the elements that are heavier than helium". Nuclear fusion is the process of combination of two smaller atoms into a larger one. It requires a high activation energy, which is reached in the stars. Elements from He to Iron were formed in the Sun, but larger elements require a higher energy and are formed inside supernovas.
The correct statement is that It produces nearly all the elements that are heavier than helium.
Both nuclear fusion and nuclear fission are the reaction process that produces energy, although both processes are completely different.
Nuclear Fusion: It is the process by which two lightweight nuclei combine together releasing a vast amount of energy.
Nuclear Fission: It is the process in which a single heavy unstable nucleus is split into two, which produces a large amount of heat.
Now if we look at the statements, In the sun, the process caused is Fusion. Therefore, the first statement is false. Also, the second statement is false. The third statement is true, as in fusion two nuclei are combined, therefore, It produces nearly all the elements that are heavier than helium.
Hence, the correct statement is that It produces nearly all the elements that are heavier than helium.
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