Mosasaurs are serpentine marine reptiles. They are not dinosaurs, but evolved from semi-aquatic squamates known as the "aigialosaurs", close relatives of modern-day monitor lizards.
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Trilobite were prehistoric marine creatures related to the extant horseshoe crab. They were one of the first living creatures to develop compound eyes which gave them 180 degree vision.
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The photos below are sample finish projects in one of our programs, Bones in a Box.