Answer: Helium nuclei can fuse to form elements such as nitrogen.
Explanation:
Nuclear fusion is a process which involves the conversion of two small nuclei to form a heavy nuclei along with release of energy.
Nuclear fission is a process which involves the conversion of a heavier nuclei into two or more small and stable nuclei along with the release of energy.
Thus in nuclear fusion , smaller nuclei must combine to form a heavier nuclei. this is a nuclear fusion reaction. Helium nuclei fuse to make carbon, followed by further reactions that produce heavier nuclei such as nitrogen and oxygen.