User blog comment:Wildoneshelper/Guess the Object (Round 2)!!/@comment-4189499-20140614072425/@comment-3225604-20140614113139

No, calcium carbonate is not found in our bodies in the form of bones. Calcium phosphate is, together with other calcium and phosphorous. "Living" refers to something which could do respiration, reproduction, have response, movement, grow and other things. Calcium carbonate couldn't do any and the function of the bones is not from the substance but from the cells.

The fun fact is my chemistry teacher says calcium carbonate is not soluble in water...