Related by context. Frequent words. (Click for all words.) 51 unicellular 50 naturally occuring 49 macroevolution 48 potentially habitable 48 Martian rocks 48 slime molds 47 microfossils 47 Earthlike 47 Poinar 47 ALH# 46 reproduce asexually 46 astrobiologists 46 extremophiles 46 stromatolites 45 insects spiders 45 fossilization 45 nonliving 44 Indohyus 44 fossils 44 humans 44 PALCA 44 isotope ratios 44 irreducibly complex 44 snail shells 44 feathered dinosaurs 43 Scientists theorize 43 single celled 43 Siberian permafrost 43 oxygen isotopes 43 spectral signatures 43 prokaryotes 43 amphipods 43 icy moons 43 flatworms 43 methanogens 43 starch grains 42 coprolites 42 Microorganisms 42 habitable planet 42 braincase 42 Felisa Wolfe Simon 42 microbial ecology 42 fossilized 42 vertebrate animals 42 multicellular 41 Meridiani 41 paleontological 41 tyrannosaur 41 Carl Pilcher 41 hadrosaur 41 fossilized remains 41 noble gases 41 lifeforms 41 FLATOW 41 photochemistry 41 plesiosaurs 41 diatom 41 Willerslev 41 single celled organisms 41 elemental composition 41 placental mammals 41 melanosomes 41 foraminifera 41 abiotic 40 simplest explanation 40 trilobites 40 evolutionists 40 evolutionary origins 40 Tiktaalik 40 Neandertal 40 Cyanobacteria 40 marine reptiles 40 primordial soup 40 archaea 40 gaseous planets 40 radiocarbon dated 40 fossil 40 geochemists 40 God Particle 39 Ardipithecus ramidus 39 Titan Saturn 39 radiocarbon 39 Varki 39 Melosh 39 theropod dinosaurs 39 paleontology 39 Evolutionists 39 ribozymes 39 Fossilized 39 organisms 39 primate evolution 39 diatoms 39 researchers hypothesize 39 baleen whale 39 systematics 39 nanomachines 39 mud volcanoes 39 Hawking radiation 39 isotopic composition 39 habitable planets 39 carnivorous dinosaurs