Biocoenosis (Biocoenose) 



The aggregate of interacting organisms living together 

 in a particular habitat, e.g., an oyster-bed community, usually 

 containing producer, consumer, reducer, and transformer 

 organisms, cf. Ecosystem, Community, Association. 



Biocoenotics 



See Biocoenology. 



Biocycle 



A subdivision of the Biosphere (q. v.). Biocycles usually 

 recognized are saltwater, freshwater, and land; each consist- 

 ing of Biochores (q. v.) cf. Biotope. 



Biodemography 



The mathematical treatment of population problems. 



Bioecology 



The branch of biology that deals with the interrelations 

 of organisms among themselves and with their environments, 

 stressing the inclusion of both plants and animals, cf. Ecology. 



Biogenesis 



The principle that living organisms can originate only 

 from other living organisms, cf. Spontaneous generation. 



Biogenic 



Refers to biological origin. 



Biogeochemical Cycle 



The circulation of chemical elements such as nitrogen, 

 carbon, etc., in specific ways from the environment into 

 organic substances in animals and plants and back again into 

 the environment. 



Biogeocenose 



A concrete or actual Ecosystem (q. v.), e.g., a certain bog. 



Biogeographic Region 



See Biome. 



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