Related by context. Frequent words. (Click for all words.) 48 trilobites 48 theropod 47 feathered dinosaurs 46 single celled organisms 46 protozoan 45 Ardipithecus 45 Neandertals 45 tetrapods 45 prokaryotes 44 mutant 44 crocodilians 44 mammalian 44 amoebas 43 Homo sapiens 43 tetrapod 43 Neandertal 43 spiny 42 tyrannosaur 42 multicellular organisms 42 Late Cretaceous 42 single celled 42 pterodactyls 42 taxa 42 Archaea 42 herbivorous 42 reptilian 42 megafauna 42 bristly 42 multicellular 41 hairy 41 hominins 41 arthropod 41 carnivorous dinosaurs 41 tyrannosaurs 41 mastodons 41 Tyrannosaurus 41 Tiktaalik 41 theropods 41 interbred 41 lineages 41 Indohyus 40 subfamily 40 triceratops 40 Neanderthals 40 clades 40 rhesus 40 cephalopods 40 H. erectus 40 dinos 40 mouthparts 40 supercontinent 40 brontosaurus 40 herbivores 40 woolly mammoths 39 hermaphroditic 39 anthropoids 39 antimicrobial peptides 39 wooly mammoth 39 Australopithecus 39 vertebrates 39 dinosaurs 39 bipeds 39 mutants 39 Mesozoic 39 apes 39 archaea 39 mammoths 39 primordial ooze 39 tyrannosaurus rex 39 lion mane 39 interbreeding 39 bipedalism 38 mammals 38 simian 38 homo sapiens 38 evolutionary biologists 38 Neanderthal 38 buff colored 38 simian immunodeficiency virus 38 cave dwelling 38 scaly skin 38 vertebrate 38 Cretaceous Period 38 eukaryotic 38 mutated 38 Lemurs 38 primate species 38 stromatolites 38 jawbones 38 introns 38 flightless birds 38 melanosomes 38 anatomically modern 37 Pleistocene 37 phylogeny 37 neuroblastoma cells 37 undifferentiated cells 37 Mammoths 37 phylogenetic 37 chimeric 37 Poinar