Crypts of Lieberkühn are located in:

In humans,the ....... teeth help in cutting.

Human teeth are:
$(1)$ Of different types.
$(2)$ Embedded in a socket of the jaw bone.
$(3)$ Formed in two sets during their life.
This type of dentition is called:

The structure of a tooth is given below. What are $P$ and $Q$?

The wall of the rectum lacks:

$A-$ The human digestive system consists of the alimentary canal and the associated glands.
$R -$ Liver,pancreas,and salivary glands are associated digestive glands.