Never, only fusion
No, fission does not naturally occur in the human body. Fission is a nuclear reaction that involves the splitting of atomic nuclei, which is not a process that happens in biological organisms.
Not typically. When a star burns it starts with fusion of Hydrogen. Later heavier atoms are formed, also by fusion. It is believed that the very heavy atoms, that release energy when split (fission) are only formed by very massive stars . These atoms are also formed by fusion. When one of these very massive stars explodes (super nova) it spews out its atoms and during this process its possible some fission will occur, but for the most part star evolution is a fusion story.
Fission does not occur in the sun, it is fusion which produces the sun's energy
Fission and fussion manly occar in a star or a sun. The reason that a star or a sun is bright is because of the heat that is given off of from fission and fussion.
Our sun is a star, and is fuelled by Nuclear Fission.
Fusion occurs in the sun.
Fusion occurs in the sun.
For a chain reaction to occur, each fission must produce at least one more fission reaction. This leads to a self-sustaining reaction where each fission event triggers more fission events, resulting in a continuous release of energy.
Currently, it can't. May be it could be in future.
Amoeba reproduces by binary fission .
I believe that yes, it should occur - assuming any atoms are left. Please note that in the case of a neutron star, most of the atoms are crushed out of existence - i.e., there are no more atoms left, except a few in the outermost layers. Similarly, in a black hole, no atoms will be left.
Fission is not a natural process in the sense that it typically does not occur spontaneously in nature. Fission reactions are artificially induced and controlled in nuclear reactors to produce energy. However, fission can occur as a natural process in some rare scenarios, such as in certain isotopes of uranium found in nature.