| Summary: | have dominated their ecosystem and subsequently lived in every sea-based environment (as well as some freshwater locations). From the warm shallow tropics to the deep open seas, they most surprisingly even adapted to the sub-freezing waters of the Arctic Ocean. (24) [illustration] Acanthodes bronni (24) There is a natural misconception to believe that since we are vertebrates, all vertebrates fit into the same box as us, whether in ability, durability, or even longevity. Take any 100-year period, and it is easy to believe that all vertebrates share a similar life span. The perfect animal to dispel this belief is the Greenland shark. (12) 32
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