Related by context. Frequent words. (Click for all words.) 55 Helicobacter 55 Biologically 55 causative agents 55 Physiologically 54 flatworm 54 protozoan 54 biting midges 54 MC1R 54 corona virus 53 Medically speaking 52 flatworms 52 prokaryotes 52 Toxoplasma 51 humans 51 nematode worms 51 infects humans 51 naturally occuring 51 incompletely understood 51 primitive organisms 51 Scientists theorize 51 Varki 50 Lactose intolerance 50 macroevolution 50 reproduce asexually 50 mechanistically 50 coevolution 50 Powdery mildew 49 ontologically 49 Saturated fat 49 naturally occurring substance 49 vertebrate animals 49 gut microbiota 49 particularly virulent strain 49 easily transmittable 49 morphologically 49 Rickettsia 49 Genetic modification 49 Bacterial infections 49 fruitflies 49 Chronic inflammation 49 Naegleria 49 Spider mites 49 epidemiologically 48 lifeform 48 Toxoplasmosis 48 organismal 48 unicellular 48 molecular underpinnings 48 PALCA 48 olfactory receptors 48 Campylobacter jejuni 48 genetic alteration 48 Fruit flies 48 metabolically active 48 protists 48 predator prey relationship 48 Firmicutes 48 gastrointestinal tracts 48 Oxidative stress 48 Caenorhabditis elegans 48 organism 48 mycobacterium 48 fungal pathogen 48 symbiont 47 mutagens 47 Toxoplasma gondii 47 irreducible complexity 47 mammalian species 47 TB bacterium 47 toothed whales 47 genetic manipulations 47 biogenesis 47 Indohyus 47 asexuality 47 abiotic 47 Chlamydia pneumoniae 47 simplest explanation 47 Wolbachia 47 macromolecule 47 microbial ecology 47 microevolution 47 convergent evolution 47 neural tissue 47 Cyanobacteria 47 microcephalic 47 nanomachines 47 amoebas 47 Ultraviolet radiation 47 Ocean acidification 47 Y. pestis 47 mammalian brain 47 nanobacteria 47 causative agent 47 irreducibly complex 47 Borrelia burgdorferi 46 Diatoms 46 female reproductive tract 46 ribozyme 46 Hox genes 46 evolutionarily 46 Clostridium perfringens