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                              Q:
                           
                           
                                                      | A) Urea is produced in liver | B) Urea is produced in blood | 
| C) Urea is produced from digestion of starch | D) Urea is produced in lung and kidney | 
                              Answer:   A) Urea is produced in liver
                              
                                                            
                              
Explanation:
                               
                           
                           Explanation:
Urea is produced in the liver and is a metabolite (breakdown product) of amino acids. Ammonium ions are formed in the breakdown of amino acids. Some are used in the biosynthesis of nitrogen compounds. Excess ammonium ions are converted to urea.
 
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