Tuppose a reptile damages one of its kidneys, and the kidney is not able to function. the levels of which material within the reptile’s body would most likely be affected?

The kidney is involved in several processes, but its main function is to ensure the detoxification of the body by removing waste by urine. It filters the blood plasma and ensures homeostasis (balance of water and ions) of the body.

In kidney damage,  the kidney indeed loses its function, and the level of all metabolites that are supposed to be eliminated by the kidney increase in the blood, like urea, ammonia, and uric acid.