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Which one of the following acts as a phy...

Which one of the following acts as a physiological barrier to the entry of microorganisms in human body?

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Microorganisms are omnipresent in vast numbers and are described as ubiquitous .They are found in soil , water , air , plants , animals , food materials , clothes , leather etc., and also can grow on extreme conditions like hot water springs , Ice Mountains , volcanic ash in sulphur springs .
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