Reptiles are highly adapted to terrestrial life, and one of their primary mechanisms for surviving in dry environments is the prevention of desiccation (water loss through the skin). This is achieved through the presence of keratinous scales, which are tough, overlapping structures made of the protein keratin. These scales create a waterproof barrier that minimizes the evaporation of internal body fluids, allowing reptiles to thrive in arid habitats where water is scarce.
There is an explanation video available below.
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