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.
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.
