• The animal kingdom is divided into more than 30 phyla.
  • Table below lists the nine phyla with the greatest number of species.
  • Each of the animal phyla listed in the table has at least 10,000 species.
  • Invertebrates make up at least 95 percent of all animal species.
  • Vertebrates are animals that have a backbone.
  • All vertebrates belong to the phylum Chordata.
  • They include fish, amphibians, reptiles, birds, and mammals.
  • The last phylum, the Chordsata, also includes many invertebrate species.
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