Most organisms in the Animal kingdom?

Most organisms in the Animal Kingdom are classified as invertebrates, which lack a backbone, and include groups such as insects, mollusks, and crustaceans. Invertebrates make up about 95% of all animal species, showcasing incredible diversity in form and function. Among vertebrates, which include mammals, birds, reptiles, amphibians, and fish, mammals are particularly notable for their complex behaviors and social structures. Overall, the Animal Kingdom is characterized by a wide range of adaptations that allow organisms to thrive in various environments.