Multiple choice general knowledge science & technology

What substance are nails made of?

  1. Calcium

  2. Sulphur

  3. Keratin

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Fingernails and toenails are primarily composed of a tough protective protein called keratin - the same protein found in hair and the outer layer of skin. Keratin provides nails with their strength and durability.

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