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Characteristics of animals
Classification of the animal kingdom
Characteristics of invertebrate animals
Classification of invertebrates
Porifera
Porifera characteristics
Structure and cells of porifera
Cnidarians
Cnidarians groups
Cnidarians characteristics
Worms
Flatworms
Groups of flatworms
Nematodes
Annelids
Molluscs
Characteristics of moluscs
Bivalves
Gastropods
Cephalopods
Arthropods
Arthropods characteristics
Myriapods
Groups of myriapods
Arachnids
Crustaceans
Insects
Echinoderms
Classes of echinoderms
