Final answer:
Peritoneum is a serous membrane covering the abdominal cavity and organs, with some organs being retroperitoneal. Mesentery is tissue formed by the double folding of the peritoneum.
Explanation:
Peritoneum is a large serous membrane that lines the abdominal cavity and covers most digestive organs. Some organs are retroperitoneal. The continuous set of tissues formed by the double folding of the peritoneum is known as mesentery.
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