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The human appendix (a small sac near the junction of the small and large intestine) is homologous to a structure called the "caecum", a large, blind chamber in which leaves and grasses are digested in many other mammals.http://scienceline.ucsb.edu/getkey.php?key=3246
The human arm would be homologous, as it is homologous to various other animals, such as a whale's fin, or a chimpanzee's arm.
by their homologous organ sturcture
Yes. Most animals don't have an appendix. Apes and monkeys have an appendix like a human's (a long tube), and rabbits and a few species of other rodents have a more sack-like appendix. None of the other animals has one.
The homologous is the study of animals.
hind limb: a posterior appendage such as a leg or the homologous structure in other animals.
I'm not sure if there is a different purpose in animals other than humans, but recent research may indicate that the appendix is a safehouse for the "good" bacteria that inhabit the intestines.
In some animals, like humans, the jury is still out as to what function an appendix serves. Humans can live without any complications if they appendix is removed. In animals such as rabbits, the appendix serves as a storage are for lymphatic tissue.
No it is not. The appendix is used to house anaerobic bacteria that assist in the breakdown of cellulose from plant material. In humans, the appendix is considered to be a vestigial organ which serves no useful purpose due to its small size, but the appendix is vital to many other animals with a primarily vegetarian diet.
An appendix
Any animal with an appendix can get appendicitis. Not all animals have appendices however.
In the animals with this organ, the appendix appears to store good bacteria to help the animal with its digestive process.