Related by context. Frequent words. (Click for all words.) 62 theropod 60 Ardipithecus ramidus 60 trilobites 59 tyrannosaur 59 Tiktaalik 58 marine reptiles 58 feathered dinosaurs 57 Indohyus 57 horned dinosaur 57 single celled organisms 57 foraminifera 56 crocodilian 56 Burgess Shale 56 lava tubes 56 tetrapod 56 fossil specimens 55 placental mammals 55 macroevolution 55 tetrapods 55 morphologically 55 stickleback 54 fossils 54 stromatolites 54 vertebrate animals 54 palaeontology 54 marine invertebrates 54 toothed whales 54 unicellular 54 Ardipithecus 54 cephalopods 54 plesiosaur 54 theropods 54 hadrosaur 54 Jurassic Period 54 Raptorex 54 phyla 54 middens 54 microfossils 54 tyrannosaurs 53 marine reptile 53 carnivorous dinosaur 53 prokaryotes 53 archaea 53 Late Cretaceous 53 Longrich 53 carnivorous dinosaurs 53 phylogeny 53 Palaeontologists 53 crocodilians 52 ammonites 52 pterosaur 52 fossilized remains 52 arthropod 52 tunicates 52 Archaea 52 faunal 52 multicellular organisms 52 hydrothermal vent 52 Columbian mammoth 52 phylogenetic tree 52 Oort Cloud 52 supercontinent 52 Lake Vostok 52 nematode worms 52 taxa 52 protozoan 52 platypuses 52 marine sediments 51 palaeontologists 51 species 51 fossil 51 phylum 51 systematics 51 pliosaur 51 diatoms 51 alga 51 Chicxulub 51 tubeworms 51 Poinar 51 Earthlike 51 convergent evolution 51 Gigantoraptor 51 Archaeopteryx 51 tyrannosaurus 51 clades 51 Stegosaurus 51 arthropods 51 primate evolution 51 clathrates 51 igneous rocks 51 coelacanth 51 fossilized bones 50 mud volcanoes 50 vertebrate species 50 radiocarbon dated 50 penguin species 50 mammals 50 sea anemones 50 wooly mammoth 50 aragonite 50 Nigersaurus