The structure you're describing at the lower end of the large intestine where water waste enters is called the rectum. The rectum is the final section of the large intestine, leading to the anus, and it is where feces are stored before being expelled from the body. Before the rectum, the large intestine includes the sigmoid colon, which connects to the rectum.
What Is The song like short tube at the lower top, at the back inside the large intestine, that Water waste enters, is called
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