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There are A LOT of differences between the Cnidaria phylum and other phylums.
1. all species in the cnidaria phylum have nematocysts which are the things that sting prey
2. jellyfish which are in the cnidaria phylum, do not have blood because they are made up of 95% of water
3. all species of cnidaria phylum have a single opening which means they eat and poop from the same place
4. can live anywhere from the tropics, to the poles, on the surface of the water, to the depths of the seas (some even bury themselves under the ocean bed)
5. have two different "stages" - polyp and medusa - some species of the cnidaria phylum just stay at the polyp stage and never move on to the medusa stage
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