Related by context. Frequent words. (Click for all words.) 57 phytoplankton blooms 56 deplete oxygen 54 phytoplankton 53 Phytoplankton 53 microscopic algae 53 absorbs carbon dioxide 53 underwater volcanoes 53 amphipods 53 photosynthetic organisms 52 plankton blooms 52 hydrothermal vent 52 decaying vegetation 52 Diatoms 51 plankton 51 planktonic 51 Methylmercury 51 aquatic invertebrates 51 terrestrial ecosystems 51 methane CH4 50 Cyanobacteria 50 protists 50 microscopic organisms 50 upwellings 50 photosynthetic bacteria 49 volcanic vents 49 undersea volcanoes 48 photosynthetic 48 marine sediments 48 microbial ecology 48 biogeochemical 48 primitive organisms 48 alga 48 aquatic habitats 48 aquatic ecosystems 48 bioaccumulation 48 biogeography 48 endemism 48 freshwater ponds 48 marine invertebrates 48 Scientists theorize 48 invertebrates 48 inter tidal 48 aerosol particles 48 phloem 48 equatorial waters 48 organisms 47 oceans 47 subglacial 47 freshwater habitats 47 sargassum 47 upper troposphere 47 Equatorial Pacific 47 Nitrogen oxides 47 seagrass meadows 47 Seafloor 47 atmospheric methane 47 Coral bleaching 47 epiphytes 47 faunal 47 frogs salamanders 47 zooplankton 47 freshwater ecosystems 47 microbes 47 temperature salinity 47 permanently shadowed craters 47 zooxanthellae 47 respire 47 reactive nitrogen 47 microorganism 46 crabs shrimp 46 Sea otters 46 temperate forests 46 oceanic 46 dinoflagellate 46 echinoderms 46 mycelium 46 tiny crustaceans 46 microscopic plankton 46 subtropical regions 46 archaea 46 seals sea lions 46 harmful algae blooms 46 gastropods 46 biogenic 46 nitrogenous 46 hydrologic cycle 46 Wadden Sea 46 macroinvertebrates 45 planetary atmospheres 45 abyssal 45 Neoproterozoic 45 sequester carbon dioxide 45 seagrasses 45 gyres 45 algae 45 copepods 45 benthic 45 Melting glaciers 45 permafrost thaws 45 isoprene 45 nitrogen fixing