Related by context. Frequent words. (Click for all words.) 51 sticklebacks 50 stickleback 50 flatworms 48 relict 48 refugia 48 Volvox 47 diatom 47 placental mammals 47 Darwin finches 46 brachiopods 46 dinoflagellate 46 taxa 46 morphologically 46 tunicate 46 temperate forests 46 platypuses 45 flatworm 45 H. sapiens 45 fig. S1 45 crocodilians 45 marine invertebrates 45 killifish 45 δ 45 Neandertal 45 Diatoms 44 trilobites 44 wolf spiders 44 pipefish 44 Scientists theorize 44 fruitflies 44 Chlamydomonas 44 bacterium Escherichia coli 44 plesiosaurs 44 erythrocytes 44 protozoan 44 ecoregions 44 sexual dimorphism 44 amphipods 44 planktonic 44 horned dinosaurs 44 Supplementary Fig 44 Xenopus 43 differentially expressed genes 43 Paranthropus 43 elegans 43 cartilaginous 43 parasitized 43 trilobite 43 quaggas 43 homo erectus 43 SN #/#/# [002] 43 T. gondii 43 giant squids 43 lowland forest 43 Neoproterozoic 43 coeval 43 baleen whale 43 symbionts 42 Archaea 42 hippocampal neurons 42 anoxia 42 genetic variability 42 vertebrate 42 homology 42 midgut 42 freshwater ponds 42 protozoan parasite 42 Plasmodium vivax 42 mammals 42 lampreys 42 Early Cretaceous 42 tunicates 42 vertebrate animals 42 echidnas 42 sessile 42 fruitfly 42 damselfish 42 ichthyosaur 42 tetrapod 41 skink 41 cichlids 41 aquatic invertebrates 41 Anopheles gambiae 41 heterozygous 41 prokaryotes 41 freshwater habitats 41 arthropod 41 molluscs 41 clades 41 oocysts 41 Streptomyces 41 isotope ratios 41 plant Arabidopsis thaliana 41 reproduce asexually 41 protists 41 mosasaurs 41 insectivores 41 foraminifera 41 diatoms 41 species 41 mole rats