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Thermal Resistance is the ability to survive extreme hot or cold temperatures. Northern merpeople may be resistant to low temperature as they swim in cold, icy waters like the seas around Canada and the Arctic Circle. The Canadian Mermaid wasn't suffering from the cold or hypothermia, even though she was swimming in an area where the temperature was very low and the humans she attacked were dressed in thick clothing to keep warm, further implying the low temperature and merpeople's resistance to cold and icy waters.

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