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Question

Ammonia is very toxic to sharks. Sharks possess a homeostatic control mechanism where they can rid themselves of ammonia to prevent auto-toxicity.
In shark livers, ammonia is combined with CO2 and _____________, where it then travels to the ____________________.
Here some waste will be sent outside the body via the excretory system, and useful materials will be reabsorbed to be used in maintaining appropriate osmoregularity.

A
Urea, bladder
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B
Nitrogenous waste, bladder
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C
Uric acid, kidneys
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D
Urea, kidneys
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Solution

The correct option is A Urea, bladder
Ammonia is toxic to sharks as sharks are cartilaginous fishes and are constantly under the endosmosis pressure. If ammonia builds up in the body, a huge amount of water will be drawn in that can cause bursting of the cells. In shark livers, ammonia is combined with CO2 and urea is formed, which then travels to the bladder.
Hence, the correct answer is 'Urea; bladder'

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