Related by context. Frequent words. (Click for all words.) 64 alga 62 nitrogen fixation 61 cyanobacteria 60 diatoms 59 diatom 58 microscopic algae 57 dinoflagellates 56 nitrogen fixing 56 marine sediments 56 isoprene 56 Archaea 56 terrestrial ecosystems 55 phytoplankton 54 protozoan 54 prokaryotes 54 photosynthetic 54 Phytoplankton 54 archaea 53 amoebae 53 myoglobin 53 chloroplasts 53 nitrogen 53 eukaryotic 53 biogenic 53 symbionts 53 atmospheric methane 53 carbonic acid 53 algae 52 multicellular 52 Chlorophyll 52 Daphnia 52 single celled 52 bioavailable 52 harmful algal blooms 51 microorganism 51 atmospheric CO 51 methane hydrate 51 naturally occurring 51 atmospheric carbon dioxide 51 methane hydrates 51 aerosol particles 51 single celled organisms 51 marine invertebrates 51 biota 51 polycyclic aromatic hydrocarbons PAHs 50 sea squirt 50 hydrothermal vents 50 abiotic 50 photosynthesis 50 atmospheric CO2 50 stromatolites 50 algal 50 auxin 50 anoxic 50 microbe 50 hydrological cycle 50 microscopic organisms 50 fungi 49 CH4 49 hydrogen ions 49 lichens 49 chloroplast 49 kerogen 49 iron fertilization 49 marine organisms 49 Photosynthesis 49 foraminifera 49 organism 49 planetary nebulae 49 anaerobic bacteria 49 catechin 49 copepods 49 chlorophyll 49 organisms 49 ellagic acid 49 organic molecules 49 microbes 49 Quercetin 49 algal blooms 49 sulphate 49 carotenoids 49 magnetar 49 phosphorescence 49 temperate zones 49 plankton 49 oxidant 49 stable isotope 49 sulphates 48 mycobacteria 48 olivine 48 seaweeds 48 naturally occurring substance 48 microorganisms 48 pollinating insects 48 zooplankton 48 gamma tocopherol 48 reactive oxygen species ROS 48 acidified 48 Nitrogen 48 water vapor 48 microbiota