Related by context. Frequent words. (Click for all words.) 49 interglacial period 48 hominins 47 prehistory 47 Homo habilis 47 multicellular organisms 46 Cretaceous Period 46 Neolithic 45 Late Cretaceous 45 anatomically modern 45 Bronze Age 45 prehistoric 45 hominids 44 interglacial 44 archeological excavations 44 fossils 44 Iron Age 44 neolithic 43 evolutionary adaptation 43 multicellular 43 Paleolithic 43 Fertile Crescent 43 H. erectus 43 marine reptiles 42 flint tools 42 millennium BC 42 Neandertals 42 theropod 42 Homo sapiens 42 Homo erectus 42 trilobites 42 microfossils 42 influenza pandemics 42 Neandertal 41 bipedalism 41 hominin 41 radiocarbon dating 41 domestication 41 #BC [003] 41 tetrapods 41 flints 41 megafauna 41 supercontinent 41 Australopithecus 41 embryogenesis 41 bone metastasis 41 Australopithecus afarensis 40 tyrannosaurs 40 dinosaur fossil 40 fossil 40 Achaemenid 40 Tiktaalik 40 archaeological excavations 40 nanosystems 40 Archaeopteryx 40 archaeological discoveries 39 vertebrate species 39 Neanderthal genome 39 Neanderthals 39 fossilized bones 39 diatoms 39 toolmaking 39 sauropod 39 Hellenistic 39 carnivorous dinosaurs 39 genus Homo 39 hominid 39 Safavid 39 Pleistocene 39 excavations 39 human genome sequencing 39 theropods 39 Younger Dryas 39 mass extinction 39 Sumerians 39 terrestrial ecosystems 39 Ardipithecus 39 sauropods 38 Carboniferous 38 single celled organisms 38 comparative genomics 38 genome mapping 38 marine invertebrates 38 dinosaurs roamed 38 Sassanid 38 DNA amplification 38 eukaryotic cells 38 Sumerian 38 Qin Dynasty 38 Homo Sapiens 38 iron overload 38 pygmy elephants 38 Han Dynasty 38 dinosaur fossils 38 Quaternary 38 human genome sequence 37 HapMap 37 Ming Dynasty #-# 37 ancient Mesopotamia 37 morphological 37 colorectal polyps 37 hunter gatherers