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A 3.5-inch worm-like projection found in the base of the colon would be the appendix while a 4.5-inch long, shoe-shaped organ found on the left side of the abdomen would be the spleen.
The appendix is a small vestigial organ found at the base of the colon. It is about a 3.5-inch long worm-like projection.
The appendix is often described as vestigial because scientists are yet to ascertain its functions in the body.
The spleen, on the other hand, is a shoe-shaped organ located close to the liver on the left-hand side of the abdomen. It is about 4.5-inches long and its functions include filtering blood, producing white blood cells and antibodies, etc.
More on appendix and spleen can be found here: https://brainly.com/question/12864099