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Keratin gives skin, hair and nails hardness and resistance to:

AWools
BWaxes
CWater
DWinds
Answer & Solution
Correct answer: C. Water
1. The protein packs the surface cells. 2. It stops fluid crossing the surface. 3. So it resists water. _Source: OpenStax Anatomy and Physiology 2e, Chapter 5, The Integumentary System._
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