Related by context. Frequent words. (Click for all words.) 65 crocodilians 61 theropod 61 Archaeopteryx 60 theropods 59 forelimbs 58 vertebrates 58 multicellular 57 multicellular organisms 57 hominins 57 mammals 56 pterosaurs 56 tetrapods 56 bipedalism 56 dinosaurs 56 carnivorous dinosaurs 55 pterosaur 55 Archaea 55 vertebrate 55 tyrannosaur 55 herbivorous 54 arthropods 54 Tiktaalik 54 prokaryotes 54 morphologies 54 phylum 54 subfamily 53 marine reptiles 53 sauropods 53 single celled organisms 53 trilobites 52 eukaryotes 52 tyrannosaurs 52 evolutionarily 52 flagella 52 flagellum 52 clade 52 arthropod 51 genus Homo 51 copepods 51 sauropod 51 evolutionary adaptation 51 Australopithecus 51 marine invertebrates 51 mammalian 51 Ardipithecus 51 baleen whales 51 herbivores 51 asexual reproduction 51 taxa 51 pectoral fins 50 terrestrial ecosystems 50 evolutionary biologists 50 Mesozoic 50 lineages 50 hind limbs 50 Velociraptor 50 Homo erectus 50 megafauna 50 Homo sapiens 50 hominid 50 ant species 50 hominin 50 T. rex 49 archaea 49 homo sapiens 49 mandibles 49 dinos 49 single celled 49 Homo floresiensis 49 Tyrannosaurus 49 humans 49 biped 49 bipedal 49 landmasses 49 clades 49 mammalian species 49 vertebrate species 49 phylogeny 49 Late Cretaceous 49 Homo habilis 49 Neandertals 49 mammal 49 Caenorhabditis elegans 48 bipeds 48 mitochondrial genome 48 lithosphere 48 locomotion 48 diatoms 48 biogeography 48 plesiosaur 48 eukaryotic 48 flightless birds 48 pterodactyls 48 hadrosaur 48 organisms 48 sea anemones 48 canine teeth 47 mammalian brain 47 supercontinent 47 cephalopods 47 hominids