Final answer:
Amino groups removed from amino acids are converted into urea by the liver, then eliminated through urine.
Step-by-step explanation:
When amino groups are removed from amino acids, they are converted to urea by the liver. The urea is then transferred to the urinary system to be excreted with urine. This process is critical because ammonia, which is produced by the removal of an amino group from an amino acid, is highly toxic. In the liver, ammonia is detoxified by being converted into urea through the urea cycle, and this less toxic compound is then safely excreted in urine.