Ontogenetically,the liver and pancreas develop from which germinal layer during embryonic development?

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

In humans, the length of the alimentary canal is about (in $\text{ feet}$)

Identify the location and function of the following:
$(1)$ Villi
$(2)$ Oxyntic cells

Explain the structure of the mouth.

The posterior part of the soft palate hangs down into the pharynx as a small,finger-like projection called the .......