______ is a vestigial hollow tube that is closed at one end and is attached at the other end to the cecum, a pouch-like beginning of the large intestine into which the small intestine empties its contents.

The Correct Answer is "Appendix".Explanation :Appendix :The appendix is a finger-like, blind-ended tube linked to the cecum, from which it develops withinside the embryo.In particular, it can function as a reservoir for useful intestine bacteria.The human appendix averages are 9 cm.One THEORY is that the appendix acts as a storehouse for GOOD bacteria, “rebooting” the DIGESTIVE system after diarrheal illnesses.Some experts believe the appendix is just a useless remnant from our evolutionary past.Surgical removal of the appendix causes no observable health problems. Spleen :The spleen is the largest organ in the lymphatic system.It is an important organ for keeping bodily fluids balanced, but it is possible to live without it.The spleen is located under the ribcage and above the stomach in the left upper quadrant of the abdomen.A spleen is soft and generally looks purple. Ileum :Ileum, the final and longest segment of the small intestine.It is specifically responsible for the absorption of vitamin B12 and the reabsorption of conjugated bile salts.The ileum is about 3.5 meters (11.5 feet) long (or about three-fifths the length of the small intestine) and extends from the middle section of the small intestine to the ileocecal valve, which empties into the colon (large intestine). Duodenum :The duodenum is the first of the three parts of the small intestine that receives partially digested FOOD from the stomach and begins with the absorption of nutrients.It is directly attached to the pylorus of the stomach.It has a C-shape, which is closely related to the head of the pancreas and consists of FOUR sections: superior, descending, horizontal, and ascending parts.