Related by context. Frequent words. (Click for all words.) 50 Ardipithecus 50 multicellular 49 phylum 48 Australopithecus 48 Cretaceous Period 48 Tiktaalik 47 theropods 47 tetrapods 47 theropod 47 clades 47 globular 46 genus Homo 46 landmasses 46 multicellular organisms 46 Archaeopteryx 46 genetically distinct 45 lobed 45 single celled 45 Homo sapiens 45 trilobites 45 common ancestor 45 tyrannosaurs 45 vertebrate 44 taxa 44 tyrannosaur 44 Neandertals 43 Late Cretaceous 43 evolutionarily 43 carnivorous dinosaurs 43 Homo habilis 43 Homo erectus 43 hominins 43 forelimbs 43 baleen whales 42 biogeography 42 phylogenetic 42 single celled organisms 42 interbred 42 hominids 42 Archaea 42 plesiosaur 42 phylogeny 42 genus 42 species 42 lineages 42 megafauna 41 clade 41 anatomically modern 41 hominid 41 Mesozoic 41 Australopithecus afarensis 41 morphologies 41 vertebrates 41 pterosaurs 41 herbivorous 40 subfamily 40 hominin 40 hadrosaur 40 bony 40 Fertile Crescent 40 arthropods 40 introns 40 eukaryotes 40 symmetrical 40 fleshy 39 dinosaurs 39 lavas 39 Neandertal 39 continental drift 39 lithosphere 39 eukaryotic 39 mammals 39 homo sapiens 39 flightless birds 39 pterodactyls 39 millennia 39 mutated 39 primate species 39 Neanderthals 39 oceanic 39 marine reptiles 39 evolutionary adaptation 39 canine teeth 39 vertebrate species 39 hermaphrodites 39 deformed 39 bipedalism 39 pendulous 38 moa 38 Pleistocene 38 millenniums 38 evolutionary 38 oceanic crust 38 herbivore 38 zygote 38 sauropods 38 chromosomes 38 ocean ridges 38 mottled 38 undulated 38 Younger Dryas