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arthropods birds mammals echinoderms molluscs cord coelenterates porifera reptiles annelids vertebrates amphibians spinal invertebrates fish five
Animals can be classified into ____________________ , if they have a spinal cord and ____________________ , if they do not have a ____________________ ____________________ . There are ____________________ groups of vertebrates animals : ____________________ , ____________________ , ____________________ , ____________________ and ____________________ . Invertebrate animals are classified into six groups : ____________________ , ____________________ , ____________________ , ____________________ , ____________________ , and ____________________ .