viruses can live in intestine but they get remove with the removing of excretory waste.
Probiotic bacteria, such as Lactobacillus and Bifidobacterium, can live in the human intestine and aid in the digestive process by breaking down food components, producing vitamins, and helping to maintain a healthy balance of gut microbiota.
For me, its the small intestine.
Human. Mouth, gullet, stomach, small intestine, large intestine, anus.
small intestine
Amylase digests starch in the human digestive system primarily in the mouth and small intestine.
Here is a link to see the human digestive system.
Intestine is a highly coiled tubular organ of the human body which is involved in the food digestion process of the human body. It contains various enzymes and acids that breaks down complex food material into body usable food material that can be used by the human body. Thank you.
A horse's digestive system operates in the same fashion as a human does, except that after chyme exits the small intestine, it goes into the large cecum to undergo fermentation (a similar process as that in the rumen of a cow) before it is moved into the large intestine and digesta expelled as feces.
our human body will be more wider & disordered without the intestine & the digestive tract would bw smaller
Here is a link to see the human digestive system.
In the large intestine otherwise known as the colon.
I am tempted towards the stomach and small intestine but in actual fact there is no two more important than any other. All the digestive organs are vital in digestion.