Help!! 3. Provide a simple explanation for nuclear fusion' and describe how this process produces energy.

Two nuclei form into one nuclei.

Explanation:

Nuclear fusion is a type of reaction in which two atomic nuclei are combined to form one atomic nuclei and subatomic particles i.e. neutrons or protons with the release of energy. In nuclear fusion reaction, some amount of reactant transform into a new atom because the mass of reactant is higher than the single atom while the remaining amount of reactant transform into energy. This reaction occurs in the sun which provides energy to the whole universe.