Organisms can be separated by their most basic characteristics into the broadest groups known as

Domains

Broadest means largest the the domains has the largest number

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They are separated into the broadest group known as domains

Explanation:

Domains are the largest groups there are

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biology is the study of life. it is the study of living organism.

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.