Which of the following is an example of a closed system? a) the earth system b) the ocean c) an ecosystem d) a biome e) material or energy that is able to move in or out of a system

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.