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66
Land animals
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. -
541
Aquatic animals
Are the first vertebrates that appeared on the planet during the Cambrian period -
Flying animals
the evolution of the birds probably began in the jurasic period and derived from dinosaur terpods
