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Fossils and the history of life. Paleozoic. Complex organisms Specialization of cells Digestive track Hard parts for preservation Exoskeleton endoskeleton Marine environments Planktonic Literol. Paleozoic Cambrian. Rise of trilobites. Paleozoic Cambrian. Paleozoic Ordovician.
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Paleozoic • Complex organisms • Specialization of cells • Digestive track • Hard parts for preservation • Exoskeleton • endoskeleton • Marine environments • Planktonic • Literol
PaleozoicCambrian • Rise of trilobites
PaleozoicOrdovician Fish scales First evidence of vertebrates