D. It expands and contrasts
Hope this helps!!
1. Moro Gulf earthquake (1976)
2. Luzon earthquake (1990)
3. Casiguran earthquake (1968)
4. Mindoro earthquake (1994)
5. Bohol earthquake (2013)
Your answer is Enamel it is the coating on teeth that helps prevent damage.
Cell wall.......... Hope it helps, Have a nice day :)
