Which layer of the alimentary canal wall is responsible for peristalsis?

The $Crypt$ $of$ $Lieberkuhn$ is an example of:

Peyer's patches are associated with the intestine and vermiform appendix in mammals. These are

The human digestive system is shown below. What are $P, Q$ and $R$?

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

$A$ $2$-year-old boy is admitted to play school. During a dental check-up,the dentist observes that the boy has $20$ teeth. Which teeth are absent?