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77 MYA, Late Cretaceous: Two dinosaurs, Troodon (on the ground) and Avisaurus (in the tree) eye one another. They are both members of the Eumaniraptora – a related group that includes the “raptor” dinosaurs and all birds.
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This is a small sample of some interesting and beautiful trilobite shapes. Their segmented body plan (with left, central, and right lobes) was easily modified through adaptation.
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