Urea is excreted by the ____ Carbon dioxide and water vapor are excreted by ____ Excretion of minerals such as potassium ion is done by the ____ Excretion of hydrogen ions is done by the ____ Excretion of extra water and salts but in small amounts is through the ____ Bonus:The bilirubin secreted in the bile is excreted through the ____

Excretion

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