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Jellyfish swimming in the Pacific, Guerrero, Mexico
描述
They don't have brains, bones or even hearts, yet jellyfish have pulsed through Earth's oceans for half a billion years.
Don't be fooled by the 'fish' in their name: they belong to the invertebrate club called Cnidaria and they're made up of about 95% water.
With their bell-shaped bodies and trailing tentacles, they're more like ocean drifters than deep-sea athletes.
Some glow, like the one pictured here in the Pacific Ocean off Guerrero, Mexico, others pack stings and a select few, like the 'immortal jellyfish,' can reset their life cycle and start again.
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