How do microvilli increase the surface area of the intestine?

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

What are the three major events that occur in duodenum?  Explain them briefly. 

Fill in the blanks with correct options:

(i) Villi are supplied with a network of capillaries and a large lymph vessel called the ____(A)_____.

(ii) Mucosal epithelium has ___(B)___ cells which secrete mucus that helps in lubrication.

(iii) In ___(C)___ glands are also present in the submucosa.

(iv) The innermost layer lining the lumen of the alimentary canal is the ____(D)____.