Related by context. Frequent words. (Click for all words.) 57 nematode worms 54 evolutionary origins 53 placental mammals 53 Poinar 51 photochemistry 51 symbionts 51 flatworms 50 nanobacteria 50 microbial ecology 50 Brusatte 50 Svante Paabo 50 Vertebrate 50 single celled organisms 50 convergent evolution 49 developmental biologist 49 prokaryotes 49 Willerslev 49 slime molds 48 gut microbiota 48 theropod dinosaurs 48 multicellular organisms 48 vertebrate 48 geochemists 47 evolutionarily 47 marine invertebrates 47 humans 47 biogeography 47 biological molecules 47 unicellular 47 vertebrate animals 47 Varki 47 Helicobacter 47 Evolutionary biologists 47 Scientists theorize 47 tetrapods 47 organisms 47 organism 46 mammalian species 46 mutant proteins 46 gut microbes 46 vertebrates 46 Toxoplasma 46 mammalian 46 protozoan 46 microbiome 46 Pruetz 46 Indohyus 46 methanogens 45 Frans de Waal 45 olfaction 45 Changizi 45 ribozymes 45 Scientifically speaking 45 sexual dimorphism 44 Wolbachia 44 Rhesus monkeys 44 multicellular 44 Sinervo 44 foraminifera 44 mole rats 44 H. sapiens 44 mammals 43 Homo sapiens 43 nonhuman primates 43 Biology Letters 43 neural tissue 43 T. gondii 43 marine reptiles 43 Simon Baron Cohen 43 epigenome 43 Umeå University 43 sticklebacks 43 Tinetti 43 reproduce asexually 43 Neandertals 43 neural cells 43 reproductive physiology 43 retroviruses 42 crocodilians 42 species Homo sapiens 42 Extraterrestrial Physics 42 isotope ratios 42 hominins 42 ecological niches 42 Quatrano 42 evolutionary adaptation 42 carnivorous dinosaurs 42 amphipods 42 Vrije Universiteit 42 lifeform 42 amoebas 42 Linköping University 42 Palaeontology 42 Carl Linnaeus 42 prairie voles 42 sapiens 41 bipedalism 41 evolutionary 41 Trinkaus 41 homo sapiens 41 olfactory receptors