Related by context. Frequent words. (Click for all words.) 61 sapiens 61 placental mammals 59 Scientists theorize 59 flatworms 59 H. sapiens 58 tetrapods 58 hominins 58 tetrapod 57 theropod 57 erectus 57 feathered dinosaurs 57 H. erectus 57 hunter gatherer societies 56 trilobite 56 anthropoids 56 Homo sapiens 56 platypuses 56 arthropod 56 unicellular 56 hominid species 55 homo sapiens 55 Australopithecus 55 reproduce asexually 54 trilobites 54 Indohyus 54 Ardipithecus ramidus 54 Gondwanaland 54 wormlike 54 Upper Paleolithic 54 horned dinosaurs 54 Ardipithecus 54 Homo habilis 53 multicellular 53 morphologically 53 Homo Sapiens 53 Tiktaalik 53 Xenopus 53 anthropoid 53 hominin 53 interbred 53 Early Cretaceous 53 echidnas 53 hominid 53 angiosperms 53 saber toothed tigers 53 baleen whale 53 humans 53 Neandertals 52 Homo erectus 52 giant tortoise 52 hermaphroditic 52 Domesticated 52 Neandertal 52 plesiosaurs 52 apelike 52 genus Homo 52 sexual dimorphism 52 skink 52 pipefish 52 Cretaceous Period 52 hunter gatherers 52 primitive 52 pit vipers 52 hermaphrodites 52 Beringia 52 braincase 52 wooly mammoth 52 Fossilized 52 fruiting bodies 52 Australopithecus afarensis 52 A. afarensis 51 afarensis 51 monkeys apes 51 cave dwelling 51 hominids 51 crocodilian 51 amphipods 51 Late Triassic 51 Falcarius 51 prokaryotes 51 single celled 51 datable 51 montane 51 radiocarbon dated 51 ancestor 51 giant squids 51 mitochondrial genome 51 insects spiders 51 theropods 51 carnivorous dinosaurs 51 nonhuman primate 51 bipedalism 51 snail shells 51 relict 51 primate species 50 sticklebacks 50 velociraptors 50 Ötzi 50 Late Cretaceous 50 tyrannosaur 50 lineages