ECOLOGY abiotic abyssal zone arboreal autotroph biodiversity biomass biome biosphere biota carbon cycle chemoautotroph commensal ecological system ecosphere ecosystem free oxygen Gaia hypothesis heterotroph niche parasite photoautotroph refugium symbiosis trophic level Related supercategory • BIOLOGY AND BIOCHEMISTRY Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) |