Watch this video about Arthropods as classes of Simple Organisms and Invertebrates. Learn about the worlds of single-celled organisms and simple animals
This title takes a closer look at the phylum Anthropoda, which includes 12 different classes containing over three-quarters of all known animals, including nearly 1 million species. Members of this group includes spiders, insects, crustaceans, centipedes, millipedes and many more obscure organisms.