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Unlike freshwater fish, saltwater fish

Aoften contain a lower concentration of salt than the water they live in.
Btend to gain water from their surroundings.
Cwould swell if they didn't conserve water.
Dwould swell if they didn't eliminate salt.

Verified Answer :

rube

Unlike freshwater fish, saltwater fish often contain a lower concentration of salt than the water they live in.

so your answer is A. often contain a lower concentration of salt than the water they live in.
hope that helps!!!!!

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