Why are there villi in the small intestine? how do they improve absorption?

Villi provides absorption of nutrients and it's important to have that in the small intestine. As the small intestine mostly collects of nutrients of digested food. They improve absorption by providing surface area and where nutrition can be collected

This is what i found on google “phytoplankton, tiny organisms that live in the ocean, are autotrophs. some types of bacteria are autotrophs. most autotrophs use a process called photosynthesis to make their food.” i hope this you for what your looking for