For which animal group would regulating the volume, solute concentration, and composition of extracellular fluids pose the least challenge?

Question

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Marine invertebrates are adapted to living in an environment with a consistent and stable osmotic pressure. This means that regulating the volume, solute concentration, and composition of their extracellular fluid poses the least challenge. Marine vertebrates have more complex systems to maintain these balances, while freshwater and terrestrial animals face greater challenges due to osmotic gradients between their bodies and their environments.

For Which Animal Group Would Regulating the Volume, Solute Concentration