Examines the key characteristics of invertebrates, the class of animals with no backbones, looks at invertebrate orders and groups, and features descriptions of the main phyla of invertebrates, including sponges, flatworms, mollusks, and others.
Content Note
The variety of life -- What are invertebrates? --Insect orders -- Invertebrate groups -- Sponges -- Cnidarians -- Flatworms -- Roundworms -- Segmented worms -- Mollusks -- Arthropods -- Echinoderms -- Organizing invertebrates.