waste - Excretion is the removal of the.....products of metabolism and substances in excess of requirements, kidneys - The excretory organ that secretes urea, excess water, and ions, deamination - The removal of the nitrogen-containing part of amino acids to form urea, death - Urea can lead to organ failure or ..... if not excreted, enzymes - The liver uses amino acids to make important proteins such as, amino acids - Urea is made from..., skin - Organ that secrete sweat, assimilates - The liver .....amino acids by converting them into essential proteins needed for the body, proteins - In the process of urea formation, amino acids that are still needed will be made into, toxic - Too much urea in the blood is...., lungs - Organ that secretes carbondioxide,

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