Question: Why do humans sweat while dogs don't?
Answer: Unlike dogs, humans have sweat glands. The sweat secreted by the sweat glands conistently vaporizes on our skin and therefore allows our body to cool down spontaneously--water absorbs certain amount of heat when vaporized (heat of vaporization). The only way dogs can moderate their body temperature is panting. The cool air lowers the temperature of the exposed tongue and consequently moderates the body temperature.
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