The rumen.
The organ that helps a rabbit to digest is stomach.
They have appendix as a working organ, its vestigial in humans.
The human appendix is a vestigial organ that no longer serves a significant digestive function. It is not directly related to the body's ability to digest cellulose, which is a complex carbohydrate found in plants. Inability to digest cellulose is due to the lack of necessary enzymes in the human digestive system.
People cannot digest cellulose
Symbiotic, not parasitic. The cow has a 4 chamber stomach, one chamber called the rumen contains these bacteria. When the cow is chewing cud, she brings up partially digested grass, re-chews it, and swallows it again into a different chamber of the stomach.Without these symbiotic bacteria the cow could no live on grass, as the mammalian digestive system is unable to digest cellulose into glucose. The bacteria do this for the cow, while the cow gives them a safe place to live with plenty of food (much more than they need for their own use).
None. Animals that can digest cellulose host special bacteria to digest the cellulose molecules, and humans do not host these.
no
Cellulose.
No
Humans can't digest cellulose.
Actually ruminants cannot digest cellulose, they have symbiotic bacteria in a part of their stomach called a "rumen" digest the cellulose down to sugars and starches that the ruminants can actually digest in another part of their stomach later.
You can not digest cellulose or what we call fiber.