Related by context. Frequent words. (Click for all words.) 59 Fertile Crescent 58 Pleistocene 58 Bering Strait 57 Cretaceous Period 56 Neandertals 56 megafauna 55 Denisovans 55 prehistory 54 woolly mammoths 53 anatomically modern 53 Homo sapiens 52 Little Ice Age 52 Late Cretaceous 52 Neanderthals 52 tetrapods 52 mammoths 52 Medieval Warm Period 51 Weddell Sea 51 Mesoamerica 50 hunter gatherers 50 interglacial 50 Tiktaalik 50 Homo erectus 49 glaciation 49 Siberia 48 landmasses 48 hominids 48 continental drift 48 interbred 48 Gondwana 48 Antarctic Peninsula 48 Antarctic peninsula 48 Oetzi 48 Holocene 47 lineages 47 mammals 47 Paleolithic 47 ancestors 47 hominid 47 tyrannosaurs 47 mammal 47 Spanish conquistadors 47 glaciers 47 carnivorous dinosaurs 47 Antarctica 47 Polynesians 47 theropods 47 Tibetan Plateau 47 Etruscans 47 palaeontology 46 homo sapiens 46 steppes 46 Ardipithecus 46 migrations 46 ancestor 46 Neanderthal 46 overhunting 46 hunter gatherer 46 migratory route 46 tropics 46 Longrich 45 voyaging 45 migratory patterns 45 prehistoric 45 volcanism 45 mastodons 45 Homo habilis 45 Arctic Ocean 45 permafrost 45 Bering 45 tyrannosaur 45 colonization 45 Anasazi 45 Mesoamerican 45 archaea 45 Prehistory 45 Arctic tundra 45 latitudes 45 Neolithic 44 musk oxen 44 domestication 44 millennia 44 Babylonia 44 vertebrate species 44 northern latitudes 44 Antarctic 44 plesiosaur 44 taxa 44 Quaternary 44 thylacine 44 floe 44 dinosaurs roamed 44 mammal species 44 rookeries 44 IPY 44 glacial melt 44 ancient Mesopotamia 44 Mesozoic 44 temperate zones 44 pikas 43 Neanderthal DNA