conditions in which an organism can exist or in which a 

 process occurs, cf. Tolerance. 



Anabiont 



A perennial plant that produces flowers and fruits many 

 times. 



Anabiosis 



Revival of an organism after apparent death, as for 

 example by dessication. 



Anabolism 



The synthesis of complex organic substances from simple 

 materials in organisms, cf. Catabolism, Metabolism. 



Anadromous 



Refers to animals having Anadromy. 



Anadromy 



The behaviour of animals such as eels and salmon which 

 live in the sea and migrate into fresh water to breed. 



Anaerobe 



An organism living in the absence of free oxygen, cf. 

 Aerobe. 



Anaerobic 



Refers to life or activity in the absence of free oxygen. 



Anaerobiosis 



The existence of life under anaerobic conditions. 



Anaerophytobionts 



The anaerobic flora of the soil. 



Analogous 



Refers to an organ of one organism that corresponds in 

 function to an organ of another animal or plant but which 

 is not Homologous (q. v.), e.g. petioles of clematis and 

 leaflets of peas as twining structures, wings of birds and 

 moths. 



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