Which structure among the following are millions of tiny finger-like projections that line the walls of the jejunum?

A long, skinny tube-like organ that is a part of the digestive system is the small intestine. 

It is situated between the large intestine and the stomach and is essential for absorbing nutrients from the food we eat.

The duodenum, jejunum, and ileum are the three major divisions of the small intestine. 

The principal site for nutritional absorption is the jejunum, which is the second portion of the small intestine. 

Villi and microvilli, which are millions of tiny finger-like projections that line the walls of the jejunum, significantly enhance the surface area that is available for nutrient absorption.