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A key characteristic of nuclear fusion is that:

1. A heavy nucleus splits into lighter ones
2. Two light nuclei combine to form a heavier nucleus
3. Mass is converted into chemical energy
4. It requires extremely low temperatures

Correct answer: Two light nuclei combine to form a heavier nucleus

Solution

Nuclear fusion is the process in which two light atomic nuclei combine to form a heavier nucleus, releasing a large amount of energy. It is different from nuclear fission, where a heavy nucleus splits.

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