During protein catabolism, the body is protected against ammonia toxicity because the
A. blood transport protein albumin carries ammonia to the lungs, where it is exhaled.
B. blood transport protein albumin carries ammonia to working cells, which can catabolize it for energy.
C. liver combines ammonia with carbon dioxide to form urea.
D. kidneys excrete ammonia from the bloodstream in urine.
Answer: C
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