Conversation so far:
where does the most absorption of nutrients occur
Absorption of the majority of nutrients takes place in the jejunum.
how does the absorption occur in the jejunum
The jejunum is specialized for the absorption through its lining by enterocytes: small nutrient particles which have been previously digested by enzymes in the duodenum.
where is the jejunum located
The jejunum is the midsection of the small intestine, connecting the duodenum to the ileum

Question: how many sections are there
Self-contained rewrite: how many sections of the small intestines are there