Photo taken from Google-:
Jellyfish have drifted along on ocean currents for millions of years, even before dinasours lived on earth. But despite their name, Jeelyfish aren't actually fish. They're invertebrates, or animals with no backbones. Jellyfish stings can be painful to humans and sometimes very dangerous. But jellyfish don't purposely attacks humans. Most stings occur when people accidentally touch a jellyfish, but if the stings is from a dangerous species, it can be deadly. Jellyfish digest their food very quickly.
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