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Which of the following is an osmotic regulatory challenge that a fish living in salt water faces? salt expulsion urea expulsion uric acid expulsion water expulsion
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Which of the following is an osmotic regulatory challenge that a fish living in salt water faces?

salt expulsion
urea expulsion
uric acid expulsion
water expulsion

User Jonathan Schuster
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Sea water has a very high salt concentration. Therefore salt expulsion is the biggest challenge as the salts have to move against a concentration gradient (from a low concentration to a high concentration.)
User Kike
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