Discussion
Assertion (A) : The freezing of sea water during winter does not kill the fishes.
Reason (R) : Only surface water is frozen.
Answer: A
Correct answer: Both A and R are true and R is the correct explanation of A.
Ice forms only at the surface, and being less dense than water it floats there, insulating the water beneath. The layer below stays liquid at about \( 4^{\circ}\mathrm{C} \), where water is densest, so the fish survive. Both are true and R explains A.
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