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