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Mesozoic Era
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An era of middle life that was a time of many changes on Earth. At the beginning, all continents were joined as a single landmass called Pangaea. Then there was the breakup of Pangea. Included dinosaurs. There were the first birds. Appearance of mammals, small/rodent like. Gymnosperms(seed bearing plants), Angiosperms(flower bearing plants). End of the era- most life forms die out suddenly. Theories, plate tectonics, environment changes, comet/asteroid/meteor blocking out the sun.
The breakup of Pangaea into Laurasia and Gondwanaland resulted in climate change. Only the animals that were able to adapt to the new climate conditions survived the mass extinction. Reptiles, which were already well adapted to the dry conditions of the Mesozoic Era, became the dominant form of land animal.
After the breakup of Pangaea early in the Mesozoic Era, reptiles were the dominant form of land animal. The first small dinosaurs appeared during the Triassic Period. Later, during the Jurassic and Cretaceous Periods larger dinosaur species evolved. Birds and mammals also appeared as the Mesozoic Era progressed. For most of the Mesozoic Era, gymnosperms were the dominant plant form. Angiosperms began to appear during the Cretaceous Period. After the mass extinction that marked the end of the Mesozoic Era, many life forms, including the dinosaurs, disappeared. Mammals became more prevalent, and angiosperms spread throughout the Cenozoic Era.