R Ram Sharma 🎓 Coach ⭐ 193.88K Points 📊 Biology Q. Keratin, a protein, is the major constituent of (A) hair and skin (B) nails and horns (C) feathers and wool (D) all the above 👁️ Show Answer 🔗 Share ⚡Menu ✅ Correct Answer: (D) all the above You must be Logged in to update hint/solution 💬 Discussion 💬 Comment