Vili are folds in the walls of the gastrointestinal tract (intestines) which increase surface area. Basically, as food and stuff you've ingested is pushed past, all these little folds (vili and microvili), they absorbs the nutrients you need in your body. And being folded lots of times means greater surface area and therefore its easier to get the nutrients!
villi
The three types of villi are: Intestinal villi-microscopic finger like projections on the inner surface of the ileum. Chorionic villi-villi on the outermost membrane of the foetus. Arachnoid villi-villi on the arachnoid membrane of the brain.
A micro villi is a micro villi
Villi. Most absorbtion occurs in the ileum btw.
Villi is plural. One is Villus, many are Villi.
Because Villi is a way for the small intestinal to increase it's surface. thus providing more space and more cells for absorption(main function). The colon on the other hand,it's primary function is to propel feces to the rectum (though is does absorb water and salts and some vitamins) and there's no need to increase it's surface because doing so doesn't help achieving it's function.
Yes, mammals have villi. An example is the villi in the intestines of humans which help to absorb nutrients.
Damaged villi of the small intestine will heal. Factors that need to be taken into consideration is how long the villi have been damaged, age of person and has reason for damaged been eliminated. A younger person with villi that has not been damaged long will see healthier villi in days to weeks. An older person with the same conditions may take months to a year to heal.
villi villi
"Villi " is not a word in English language.
The noun 'villi' is the plural form of the singular noun 'villus'.
-Villi The first answer is correct in the villi are very small finger like projections in the intestines but I would suspect the question refers to the appendix.