Sharks are osmoconformers, but have a rectal gland that is similar in function to the salt gland of sea birds and sea turtles. This is an adaptation to which of the following problems?

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Sharks are osmoconformers, meaning they maintain an internal environment that is isotonic to their marine surroundings. However, they tend to accumulate excess ions, particularly sodium and chloride, from their environment. The rectal gland helps in excreting these excess ions, particularly salt, to maintain ionic and osmotic balance.

Sharks Are Osmoconformers, but Have a Rectal Gland That Is