Labels:text | screenshot | font OCR: PALEOZOIC ERA 570-248 MYA Groups of invertebrates ( animals without a backbone) became widespread in the seas during this era. Fish (the first vertebrates) and land plants appeared. Land animals evolved, including insects, amphibians (vertebrates that can live on land and in water), and reptiles (scaly vertebrates that lay eggs on land). Then many species died out.
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