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The transition from an aquatic to an terrestrial environment has evolved independently and successfully many times in various animal groups.3 Many of the terrestrial lineages originated in a tropical or mild climate during the Paleozoic and Mesozoic years, however few animals Became completely terrestrial during the Cenozoic.
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Are the first vertebrates that appeared on the planet during the Cambrian period
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the evolution of the birds probably began in the jurasic period and derived from dinosaur terpods
