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I'm pretty sure it's Keratin :l

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βˆ™ 13y ago
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AnswerBot

βˆ™ 5mo ago

Skin is the tough waterproof substance that protects the body from excess fluid loss. It acts as a barrier to prevent dehydration and regulates body temperature. Additionally, skin also helps in guarding against harmful pathogens and UV radiation.

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βˆ™ 12y ago

Saliva and skin

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Q: Tough waterproof substance that protects body from excess fluid loss?
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