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Bone matrix is very hard because of:

AIron salts
BSodium salts
CCalcium salts
DChondroitin
Answer & Solution
Correct answer: C. Calcium salts
1. Bone and cartilage are both connective tissues. 2. Cartilage is pliable because of chondroitin salts. 3. Bone is hard because of calcium salts. _Source: syllabus Biology, Chapter 20, Locomotion and Movement._
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