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Mesozoic Era Early Mammals

The mesozoic era 252 to 66 million years ago the mesozoic era had a lot of firsts. Mammals are a monophyletic vertebrate group to which we human beings belong.

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These animals grew so large they dominated the planet.

Mesozoic era early mammals. The age of dinosaurs. The first mammals also appeared during the mesozoic but would remain small less than 15 kg 33 lb until the cenozoic. They have therefore been the focus of numerous studies during the last two centuries.

The mesozoic era is literally the era of middle life. During most of the mesozoic era animal life was dominated by archosaurs dinosaurs and pterosaurs flying reptiles. Not only was this a significant era for evolution but also for climate and tectonic activity.

The mesozoic era is the age of dinosaurs. Dinosaurs were so dominant that it took a catastrophic environment changing event for mammals to be able to take over. As mentioned above the first mammals evolved toward the end of the triassic period from a population of therapsids the mammal like reptiles that arose in the early permian period and produced such uncannily mammal like beasts as thrinaxodon and cynognathus by the time they went extinct in the mid jurassic period some therapsids had evolved proto mammalian traits fur cold noses warm.

For example it had the first birds first mammals first dinosaurs and first flowering plants. The early mammals that were coeval with dinosaurs in the mesozoic are of particular importance in understanding the origin evolution phylogeny and early life of the group. The first birds and eutherian mammals mammals similar to rats started appearing in the jurassic period too.

The flowering plants angiosperms arose in the triassic or jurassic and came to prominence in the late cretaceous when they replaced the conifers and other gymnosperms as the dominant trees.

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