(Reuters) The Greenland shark, a big and slow-moving deep-ocean predator that prowls the waters of the Arctic and North Atlantic, can claim the distinction of being the planet’s longest-living vertebrate, with a lifespan perhaps reaching about 400 years. Its extremely sluggish growth rate, about four-tenths of a inch (1 cm) per year, had already tipped off scientists that it lived a very long time, and research published on Thursday (August 11) calculated the Greenland shark‘s […]