Jellyfish or jellies are the major non-polyp form of individuals of the phylum cnidaria. They are typified as free-swimming marine animals consisting of a gelatinous umbrella-shaped bell and trailing tentacles. The bell can pulsate for locomotion, while the stinging tentacles can be used to capture prey.
Jellyfish are among the most spectacular marine species in the world. They can be found in all of the seas and oceans of the world at every level of the water, from the surfaces to the very depths. Different species thrive under different climatic conditions and the jellies are known to exist in the coldest waters of the arctic to the warm waters of the equator.
Very few species of animal are able to survive across different climatic conditions, and most species can only be found in specific locations under specific conditions. Not so for the jellies; they thrive just about everywhere.
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