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, floats there and insulates the water below, which stays liquid at about \( 4^{\circ}\mathrm{C} \). The fish therefore survive beneath it. Both are true and R explains A.
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