Explain keratinization in terrestrial vertebrates.

Keratinization is a key adaptation in terrestrial vertebrates that enables them to survive in land-based environments. This process involves the production of keratin, a tough, fibrous protein found in the skin, nails, hair, and other epithelial tissues. Keratinization helps to form a _________ _____ _____ ______ ________ _______ ____ ____ ________ ____ __________.
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