Related by context. Frequent words. (Click for all words.) 56 respire 56 photosynthesizing 53 gastrointestinal tracts 53 digestive juices 53 photosynthesize 53 microscopic bugs 52 oxidise 52 endothermic 52 absorbs carbon dioxide 52 excreting 51 phloem 51 deplete oxygen 51 adenosine triphosphate 50 metabolizing 49 humidify 49 acidify 49 monoxide 48 Hydrogen sulfide 48 Sulphur dioxide 48 detoxifies 48 Gamma rays 48 boiling kettle 48 potent greenhouse gas 47 reactive nitrogen 47 metabolise 47 carbon dioxide concentrations 47 fungal spores 47 inorganic mercury 47 Tiny particles 47 inflowing 47 hydrologic cycle 47 bioaccumulate 47 Uric acid 47 Methylmercury 47 metabolically active 47 chloride ions 47 excretes 47 daphnia 46 amphipods 46 respiration 46 dehydrates 46 absorbing carbon dioxide 46 photosynthetic bacteria 46 Nitrogen oxides 46 dehydrate 46 microbes 46 denature 46 Avoid caffeine 46 decomposing organic 46 gaseous emissions 46 aromatic hydrocarbons 46 larvae hatch 46 moistens 46 hydroxyl radicals 46 digestive tracts 46 volcanic vents 46 unburned hydrocarbons 46 peristalsis 45 acidifying 45 methane ethane 45 methane CH4 45 serotonin neurotransmitter 45 toxic residues 45 liquefies 45 gastric juices 45 planktonic 45 Physiologically 45 oxidising 45 blowholes 45 excrete 45 Burning fossil fuels 45 metabolic 45 oxygen ions 45 carbohydrates fats 45 cat dander 45 biogenic 45 oxygenating 45 fecal material 45 caddisflies 45 decaying vegetation 45 Dietary fiber 45 oxidizes 45 naturally occurring substance 45 absorb carbon dioxide 45 absorbs sunlight 45 thyroid glands 45 Prenatal exposure 45 insects rodents 45 protists 44 dehydrating 44 Lactic acid 44 microorganisms 44 Skipping meals 44 carbonic acid 44 absorbs moisture 44 microgravity environment 44 Gulping 44 coagulates 44 radioactive byproducts 44 ultra violet radiation 44 oxygen uptake