Related by context. Frequent words. (Click for all words.) 62 trilobite 60 greenish brown 60 snail shells 59 medullary bone 59 otolith 59 tetrapod 58 arthropod 58 cattail 57 ammonites 57 diatom 57 cartilaginous 57 braincase 57 Fig. 1A 56 staghorn 56 fruiting bodies 56 inflorescence 56 theropod 56 protozoan 56 Fossilized 56 amphipods 56 diatoms 55 placental mammals 55 trilobites 55 unicellular 55 isotope ratios 55 Jurassic Period 55 feathered dinosaurs 55 striations 55 bony plates 55 horned dinosaurs 55 calcareous 55 mottled brown 55 anglerfish 55 Early Cretaceous 55 angiosperms 55 hadrosaur 55 californica 55 xylem 55 marine invertebrates 55 whorls 54 Raptorex 54 morphologically 54 teosinte 54 aragonite 54 Neandertal 54 plesiosaurs 54 prickly pears 54 striated 54 yellowish brown 54 stalactite 54 tyrannosaur 54 flatworms 54 convergent evolution 54 morphology 54 iridescence 54 baleen whale 54 fossilized 54 snail shell 54 brownish red 53 Late Cretaceous 53 mosasaur 53 Tiktaalik 53 egg sacs 53 radiocarbon dated 53 canadensis 53 taxa 53 papillae 53 phylogenetic tree 53 whorl 53 elegans 53 gastropods 53 taxon 53 morphological 53 arthropods 53 vertebrate animals 53 chalcedony 53 bivalve 53 wooly mammoth 53 fossil 53 mouthparts 53 bird beak 53 damselfish 53 crocodilian 53 threadlike 53 purplish red 53 swallowtail 53 anemone 53 single celled 53 filamentous 53 sea anemone 53 Diplodocus 53 foraminifera 53 photosynthetic organisms 52 coprolites 52 coniferous trees 52 herbivore 52 tunicates 52 Xenopus 52 Sinervo 52 sea urchins 52 pinkish red