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Fossil Animals: Invertebrates

Invertebrates, the animals without backbones, first appeared on the Earth during the Cambrian period. The most common early animals were arthropods, the trilobites. They were soft-bodies animals living mostly in the sea. Another important fossils of invertebrates found during the Paleozoic time were molluscs, echinoderms, crinoids (sea lilies: cup-shaped body), starfish and corals. Fossils of

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