What are the bony sockets of the jaw in which the teeth are embedded called?

Choose the incorrect sentence.

Brunner's glands are found in which of the following layers?

Select the correct option:
$(1)$ The non-enzymatic digestive juice is Saliva / Bile.
$(2)$ The Caecum / Colon is a vestigial organ in humans.

In the jaw of an adult human,which teeth are equal in number?

Once the undigested and unabsorbed substances enter the caecum,their backflow is prevented by