Basis of classification in detail

Arrangements of cells

  • cellular level --- porifera
  • tissue level ---
    • Coelenterata (Cnidaria)
    • Ctenophora
  • organ level ---
    • Platyhelminthes
  • organ level ---
    • Aschelminthes
    • Annelida
    • Arthropoda
    • Mollusca

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