Which change occurs at the anode in an operating electrochemical cell?

The change that occurs at the anode in a functioning electrochemical cell is oxidation (loss of electrons).

Explanation:

Electrolysis is the process that uses electrical energy to induce a redox reaction that is not spontaneous. It is carried out in electrolytic cells, which are powered by an external source, (a battery or other source of electrical current). That is, electrolytic cells or cells are known as the containers that contain the dissolved or molten electrolyte in which the electrodes connected to a direct current source from which the electrons come are immersed. In electrolytic cells, the chemical reaction that produces the energy does not happen spontaneously, but the electrical current is transformed into a chemical reaction of oxidation-reduction.

The anode is the electrode that loses electrons in an oxidation reaction. It is normally linked to the positive pole of the transit of electric current.

So, the change that occurs at the anode in a functioning electrochemical cell is oxidation (loss of electrons)

the answer is the

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.