Final answer:
The liver assists the kidneys by converting toxic substances into water-soluble substances that can be excreted. This detoxification mechanism occurs in the liver and is an important function.
Step-by-step explanation:
The liver assists the kidneys in converting substances so they can be excreted. The liver functions to convert toxic substances to water-soluble substances that can be excreted by the kidneys. This detoxification mechanism occurs in the liver and is one of its important functions. For example, the liver breaks down ammonia, a toxic substance, into urea, which is then filtered and excreted by the kidneys.