Which of these terms refers to microorganisms that are always present but usually not harmful to clients?

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Skin serves as a physical barrier to infectious agents and produces secretions (e.g. ,sebum)that kill some bacteria.Normal or resident flora are organisms residing on the skin and in the body that compete with pathogenic flora for food and inhibit multiplication of these pathogens,but usually are not harmful.

Which of These Terms Refers to Microorganisms That Are Always