The hardest substance of the vertebrate body is

The condition where teeth are embedded in a socket of the jaw bone is called:

Match the names of glands listed under column $-I$ with the location given under column $-II$, choose the answer which gives correct combination of the alphabets of the two columns.

Column $-I$ (Glands)	Column $-II$ (Location)
$(A)$ Crypts of Lieberkuhn	$(p)$ Loop of duodenum
$(B)$ Pancreas	$(q)$ Stomach
$(C)$ Adrenal gland	$(r)$ Intestine
$(D)$ Gastric gland	$(s)$ Kidney

Crypts of Lieberkühn are located in:

The diagram given below depicts the human digestive system. Label it from $A$ to $F$ and choose the correct option accordingly.

Which teeth are most numerous in the human jaw?