Bios 



Plant and animal life. 



Bioseston 



The living components of the Seston (q. v.). 



Biosocial Facilitation 



See Facilitation, social. 



Biosphere 



The portion of the earth and its atmosphere that is ca- 

 pable of supporting life; may be subdivided into Biocycles, 

 Biochores, Biotopes (q. v.). 



Biosystem 



See Ecosystem. 



Biosystematics 



The study of living organisms for the purpose of recog- 

 nizing and differentiating biotic units and their classification 

 into taxa on the basis of genetic relationships. 



Biota 



All of the species of plants and animals occurring within 

 a certain area or region. 



Biothermal Zones 



The divisions according to Merriam of the flora and 

 fauna of North America on the basis of temperature data. 



Biotic 



Refers to life, living. 



Biotic Area 



A general term to denote any large area that can be delim- 

 ited from adjacent areas on the basis of the composition of 

 its Biota. 



Biotic Balance (Biological Equilibrium) 



The state of more or less self-regulation of the- numbers 



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