Select the true statement.

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(C) The correct statement is that sharks retain a large amount of urea in the blood as a major osmolyte to balance the osmolarity of the body fluids.$

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Sharks retain a large amount of urea in the blood as a major osmolyte to balance the osmolarity of the body fluids.

Vedclass · Answer

(C) The correct statement is that sharks retain a large amount of urea in the blood as a major osmolyte to balance the osmolarity of the body fluids.$1$. In most bony fishes,gills play a major role in the excretion of nitrogenous waste (ammonia) by diffusion,not the kidneys.$2$. Ammonia is highly toxic,whereas urea is $100,000$ times less toxic than ammonia.$3$. Most terrestrial reptiles excrete uric acid to conserve water.$4$. Sharks retain urea and $TMAO$ (Trimethylamine oxide) in their blood to maintain the osmolarity of their body fluids,which helps them survive in a marine environment.

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