The answer for my question, that is " What is egestion " I understood the answer but I didn't understand the meaning of the word dut ?
The expulsion of undigested food from the gut through the anus is egestion.
Egestion is different from excretion because excretion involves the removal of any and all waste products that are generated in the body, while egestion is the removal of undigested waste material from the gut through the anus.