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Freshwater fish die in sea water mainly because of:

ALack of daylight
BToo much food
CColder water
DOsmotic problems
Answer & Solution
Correct answer: D. Osmotic problems
1. Sea water is far saltier than fresh water. 2. Water would rush out of the fish's cells. 3. These osmotic problems kill it. _Source: syllabus Biology, Chapter 13, Organisms and Populations._
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