"What type of animals are hydrozoa usually?", "very small, predatory animals" "What body types do they demonstrate?", "polyp and medusa" "What is the name of the "shelf" seen on the medusa?", "vellum" "How are the polyps usually arranged?", "colonial" "Where is this class (Hydrozoa) found?", "ocean" "What class is it in and what is it called?<br /> what Phylum?", "Phylum: Cnidaria<br /> class: Hydrozoa<br /> called velella velella" "What class? what phylum?", "class: hydrozoa<br /> phylum: Cnidaria"
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