Multiple choice

The element common to bone and cement is

  1. silicon

  2. phosphorus

  3. nitrogen

  4. calcium
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Calcium is a key component in both bone and cement. In bones, calcium phosphate (hydroxyapatite) provides structural strength and rigidity. In cement, calcium compounds like calcium silicate hydrate form during the curing process, binding the material together. The other elements listed are not major components of both materials.

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