Q. (I). Organisms living in oceans, lakes and rivers face water-related problems.
(II). Euryhaline can. tolerate a wide range of salinities
(III). Stenohaline are restricted to a narrow range of salinities
(IV). No fresh water animals cannot live for.long in sea water but sea animals can live in fresh water for long time because of osmotic balance
(V). The salt concentration is less than in inland water, in sea and > in some hypersaline lagoons,

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Solution:

Correct answer is (c) Only is wrong