The Diversity of Living Organisms

Although many prokaryotic organisms are single-celled (unicellular), some exist as multicellular filaments or collections of cells. Eukaryotic organisms may be unicellular or multicellular. Most eukaryotic cells are at least 5 pm in diameter, but many are much larger. The cells of most prokaryotes are small, ranging from 0.2 to 1 / m in diameter, but a few are much larger. 

Domain Archaea Verrucomicrobia, Cytophaga-Flavobacterium, Deinococci 

Kingdom Animalia (only the major phyla are listed)  

Phylum Mollusca Chitons, snails, clams, squids, octopi 

Phylum Arthropoda Scorpions, spiders, crabs, insects, millipedes, centipedes 

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