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Human bodies can become acclimatized to some levels of cold and heat. That means people get used to the climate where they live.
If you go to a place that’s hotter or more humid than you’re used to, you’ll be uncomfortable at first. But your body will soon adjust. You’ll start to sweat more, and your temperature won’t rise as much when you exercise. Human bodies are good at adapting. That’s one of the main reasons we can live in so many different climates.