The migratory eel, Anguilla rostrata, lives as a juvenile in fresh water, but then migrates through the ocean as an adult. Which of the following adaptations would facilitate the transition from fresh water to salt water?

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B) Adult eels migrating through the ocean would need to be better at removing salt from their bodies compared to juveniles, as they are moving from a freshwater environment, where the body is typically saltier than the surrounding water, to a saltwater environment, where the body is less salty than the surrounding water. This adaptation helps them maintain osmotic balance in the different environments.

The Migratory Eel, Anguilla Rostrata, Lives as a Juvenile in Fresh