What were some of the key appearances and radiations in the mesozoic era?

The Mesozoic Era, often called the "Age of Reptiles," saw the emergence of dinosaurs as dominant land vertebrates, with significant radiations into various forms, including theropods and sauropods. This era also witnessed the appearance of the first mammals and birds, evolving from theropod ancestors. Additionally, the period saw the diversification of reptiles, including marine reptiles like ichthyosaurs and plesiOSaurs, as well as the rise of flowering plants, which transformed terrestrial ecosystems.