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Physical barriers: skin on our body is the main barrier, which prevents entry of the microorganisms. Mucous coating of the epithelium lining in the re

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$I, II\;and\; III$

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Physical barriers: skin on our body is the main barrier, which prevents entry of the microorganisms. Mucous coating of the epithelium lining in the respiratory, gastrointestinal and urogenital tracts also helps in trapping the microbes entering our body

Except skin, other physical barriers which also helps to prevent the entry of the microorganisms are

$I.$ mucus coating of the epithelium lining the respiratory

$II.$ gastrointestinal tracts

$III.$ urogenital tracts

Choose the correct option

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Except skin, other physical barriers which also helps to prevent the entry of the microorganisms are $I.$ mucus coating of the epithelium lining the respiratory $II.$ gastrointestinal tracts $III.$ urogenital tracts Choose the correct option