Multiple choice

Bones are composed of calcium, chondroitin sulphate and hydroxyapatite. Hydroxyapatite is composed of calcium, oxygen, phosphorus and hydrogen. What percentage of calcium is present in the bones?

  1. 18.5%

  2. 41.4%

  3. 39.8%

  4. 70%
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Bones are made up of 39.8% calcium by mass.

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