Multiple choice

Human hair is made of the same substance as

  1. finger nails

  2. teeth

  3. bones

  4. muscles

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hair and fingernails are both composed primarily of keratin, a tough fibrous structural protein that provides strength and protection. Teeth contain enamel and dentin, bones are made of calcium phosphate minerals, and muscles are composed of different protein fibers called actin and myosin.