Which phrase best describes nuclear fusion?(1 point)
the spontaneous emission of radiation from an unstable nucleus
the spontaneous emission of radiation from an unstable nucleus
the process by which a large nucleus is divided into smaller nuclei
the process by which a large nucleus is divided into smaller nuclei
a series of reactions in which particles from one reaction trigger the next reaction
a series of reactions in which particles from one reaction trigger the next reaction
the process by which small nuclei combine into a larger nucleus