Explain why perennial aquatic mammals (whales, dolphins) have much more powerful insulating covers (subcutaneous fat) than terrestrial animals living in harsh and cold conditions. For comparison: the temperature of salt water does not drop below -1.3 ° C, and on the surface of land it can drop to -70 ° C.)
water has a significantly higher thermal conductivity and heat capacity than air. A warm object in water will cool down (give off heat) much faster than in air.
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