How do Skin, Hairs, Saliva form the first line of defense against diseases

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How do Skin, Hairs, Saliva  form the first
line of defense against diseases? 

Answer: Skin, Nose hairs, Saliva act as the first line of defense.

Skin: It forms a physical barrier thus preventing the entry of of microbes.

Hairs: Prevent entering dust particles and germs.

Saliva: It washes away bacterial growth from teeth and mouth.

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