The period during which most of Earth's land was divided into two large land masses and in which lizards, several groups of mammals, and flowering plants first appeared was the

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The Triassic period, which occurred about 251 to 199 million years ago, was when most of Earth's land was divided into two large land masses called Laurasia and Gondwana. This period saw the diversification of several groups of mammals, the appearance of flowering plants, and the first appearance of dinosaurs and lizards. The Permian period was characterized by the diversification of therapsids and the extinction of many species due to extreme environmental conditions. The Devonian period saw the evolution of fish with jaws and the colonization of land by plants. The Jurassic period was marked by the dominance of dinosaurs and the diversification of several groups of reptiles, but it was not when most of Earth's land was divided into two large land masses. The Cretaceous period was when dinosaurs dominated and ended with a mass extinction event that wiped out many species, including the dinosaurs.

The Period During Which Most of Earth's Land Was Divided