All of the organisms of different populations that live in a place, together with their physical environment is know as A. a community
B. A biome
C. An ecosystem
D. The biosphere

Its A or D

Explanation:

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.