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Homeostasis and osmoregulation - class-XII
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Most vertebrates can maintain a constant internal osmolarity different from the surrounding medium, except
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A
Both $(A)$ & $(B)$
💡 Explanation:
Most vertebrates are osmoregulators, but Myxine (hagfish) are osmoconformers, and sharks are osmoconformers that maintain internal osmolarity near that of seawater using urea. Since both A and B are correct examples of non-osmoregulating vertebrates, D is the correct choice.