the first group of animals to live on land was the
Evolutionary history of life Ediacara biota appear during the Ediacaran period,[37] while vertebrates, along with most other modern phyla originated about 525 Ma during the Cambrian explosion.[38] During the Permian period, synapsids, including the ancestors of mammals, dominated the land,[39] but most of this group became extinct in the Permian–Triassic extinction event 252 Ma.[40] During the recovery from this catastrophe, archosaurs became the most abundant land vertebrates;[41] one archosaur group, the dinosaurs, dominated the Jurassic and Cretaceous periods.[42] After the Cretaceous–Paleogene extinction event 66 Ma killed off the non-avian dinosaurs,[43] mammals increased rapidly in size and diversity.[44] Such mass extinctions may have accelerated evolution by providing opportunities for new groups of organisms to diversify.[45]
History of agriculture Scholars have developed a number of hypotheses to explain the historical origins of agriculture. Studies of the transition from hunter-gatherer to agricultural societies indicate an antecedent period of intensification and increasing sedentism; examples are the Natufian culture in southwest Asia, and the Early Chinese Neolithic in China. Current models indicate that wild stands that had been harvested previously started to be planted, but were not immediately domesticated.[1][2]