(a) Which is the hardest tissue in the body ? How ?
(b) What is meant by dried bone and decalcified bone ?

Explanation

(a) Bone is the hardest tissue in the body. Hardness is due to the calcification of its matrix.
(b) A dried bone is devoid of its organic matter and has only inorganic part. On the other hand, if bone's inorganic part is dissolved (when bone is placed in a dilute acid), and organic part is left behind, such a bone is said to be decalcified bone.