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They probably suffer from a specific deep-sea condition
It’s estimated that jellyfish have been around for at least 500 million years. Some scientists even suggest they have been living in the world’s oceans for up to 700 million years. Just like the giant isopod, it has therefore been suggested that they have developed a particular deep-sea condition called “deep-sea gigantism.”As the name of the condition suggests, creatures suffering from it grow much bigger than their counterparts living in shallower waters.
