Answer :
Final answer:
For fusion to occur, high temperatures and specific conditions are essential to overcome repulsion and sustain reactions.
Explanation:
Fusion occurs when two nuclei collide under high temperatures (about 15,000,000 K or more), providing enough kinetic energy to overcome the repulsion due to their positive charges. The conditions necessary for fusion include achieving the temperatures necessary for the reactions to occur, raising the density of the fuel, and confining it long enough to produce substantial energy.
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