Cells, the basic unit of life, are derived from spontaneous generation.
The abdominal cavity is lined by peritoneum. It is a membrane that covers the inner layer of the cavity and also the organs inside. The membrane on the inner wall is parietal Thperitonium and the membrane that lines the organ is called visceral peritoneum. This helps in fixation and support of abdominal organs.
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Radio waves, microwaves, infrared and visible light can all be used for communication.