Nitrogen wastes from the breakdown of proteins and amino acids are removed from the body by the a conversion of ammonia to urea in the liver and

 Nitrogen wastes from the breakdown of proteins and amino acids are removed from the body by the a conversion of ammonia to urea in the liver and filtration by the kidney; b conversion of ammonia to urea in the kidney and filtration by the kidney; c conversion of urea to ammonia in the liver and secretion by the kidney; d conversion of urea to ammonia in the kidney and secretion by the kidney; e conversion of nitrogen to ammonia in the liver and secretion by the kidney