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Echinoderms have an internal water canal system and tube feet with suckers that they use to move
They appeared at the start of the Cambrian period and flourished throughout the lower Paleozoic era before beginning a drawn-out decline to extinction when the last of the trilobites disappeared in the mass extinction at the end of the Permian 250 million years ago (m
Wasatchian
the horns of Bison antiquus measured approximately 3 feet
Camarasaurus vertebra (Replica) T-Rex Echinoderms have an internal waterCAMARASAURUS (pronounced KAM ah rah SAWR us) Camarasaurus (meaning "chamber vertebra") was a large, long necked plant eating dinosaur that lived during the late Jurassic period, about 156 145 million years ago. This sauropod was about 60 ft (18 m) long and weighed roughly 28000 kg. The type species is Camarasaurus supremus. This giant vertebra is from the Jurassic Age, Cleveland Lloyd Quarry of Utah. This rare specimen measures 23inches tall, 17
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