Which large group of animals consists largely of osmoconformers?

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Osmoconformers are animals that have body fluids with the same salt concentration as the surrounding water. Marine invertebrates, such as jellyfish, sea urchins, and crabs, are examples of osmoconformers. Bony fish, on the other hand, are mostly osmoregulators, meaning they actively regulate their salt and water balance to maintain homeostasis in different environments. Mammals, insects, and amphibians are also mostly osmoregulators.

Which Large Group of Animals Consists Largely of Osmoconformers