Related by context. Frequent words. (Click for all words.) 53 microbial 49 oxidative 49 nitrogen fixation 48 photosynthetic 48 homeostatic 48 physiological 47 ecological 47 biosphere 47 climatic 47 nitrogen fixing 47 redox 47 ecosystems 47 aquatic ecosystems 46 speciation 46 ecologies 46 benthic 45 biota 45 diatom 45 hydrological cycle 45 metabolic 45 biophysical 45 biochemical 44 flora 44 planetary 44 earths 44 organisms 44 morphological 43 flora fauna 43 biological 43 chirality 43 herbivores 43 soil fertility 43 naturally occurring 43 habitat fragmentation 43 microflora 43 colloidal 42 fluxes 42 microorganisms 42 physiologic 42 biodiversity 42 invertebrate 42 lifeforms 42 Fungal 42 sedimentation 42 anthropogenic 42 Microbial 42 elemental 42 bacteria fungi 41 oceanic 41 diatoms 41 evolutionary 41 forest ecosystems 41 ecology 41 acidification 41 radiative 41 freshwater ecosystems 41 biogenic 41 desiccation 41 alga 40 clonal 40 cyanobacteria 40 microbes 40 species extinctions 40 bacterial 40 salinity 40 hormonal 40 species 40 oxidation 40 single celled 40 estuarine 40 Phytoplankton 40 phytoplankton 40 degradation 40 vibrational 40 metabolic pathways 40 soils 39 photosynthesis 39 hydrologic 39 isotopic 39 creatures 39 coral reef ecosystems 39 mitochondrial 39 arboreal 39 fungi 39 oxidant 39 eukaryotic 39 mammalian 39 Climatic 39 marine ecosystems 39 multicellular 39 salivary 39 perturbations 39 geomagnetic 39 megafauna 39 aridity 39 oxidants 39 fauna 39 Darwinian 39 marine organisms 39 hematopoietic 38 atmospheric