During which period did the following events occur: recovery of the biota after a major mass extinction; increase in the species richness of invertebrate groups; appearance of the first turtles and frogs; and beginnings of a large radiation of reptiles?

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The recovery of the biota after a major mass extinction (the Permian-Triassic extinction) and the increase in the species richness of invertebrate groups (particularly mollusks) occurred in the early Triassic. The appearance of the first turtles and frogs also occurred in the Triassic, as well as the beginnings of a large radiation of reptiles. The Cambrian is much earlier and known for the explosion of diverse animal life, and the Jurassic and Cretaceous periods are known for the dominance of dinosaurs.

During Which Period Did the Following Events Occur: Recovery of the Biota