Why are lungs are lined by single squamous epithelium, but the skin is lined by stratified compound epithelium?

Squamous epithelium is found lining surfaces such as skin or alveoli in the lung, enabling simple passive diffusion as also found in the alveolar epithelium in the lungs.  Stratified cuboidal epithelium protects areas such as the ducts of sweat glands, mammary glands, and salivary glands.

Explanation:

Alveoli in lungs are the sites of exchange of gases (O² and CO²) for respiration. Hence, they are lined with thin squamous epithelium, which allows diffusion of gases.

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