curs almost exclusively by asexual means, syn. Agameoo, 

 binom. 



Agamospermy 



Production of seed asexually, exclusive of vegetative 

 reproduction, cf. apomixis. 



Age and Area 



Willis* hypothesis that the older a species is, the larger is 

 the area that it occupies. 



Age Class 



A stand in which all of the trees originated in the same 

 regeneration period, cf. Even-aged. 



Age Distribution 



The classification of individuals of a population accord- 

 ing to age classes or periods such as prereproductive, repro- 

 ductive, and postreproductive. 



Agglutination 



Formation of clumps of microorganisms or cell inclusions. 



Aggradation 



Building up of a portion of the earth's surface toward 

 uniformity of grade by deposition, as on the bottom of a lake. 



Aggregate 



A cluster of particles as a crumb of soil; to collect particles 

 into a cluster. 



Aggregation 



The coming together of organisms into a group, e.g., 

 offspring clustered about the parents. The condition of 

 being collected into a cluster or group, cf. Community. 



Agonistic Behaviour 



An activity such as fighting, feigning, and escaping, con- 

 nected with conflict between animals. 



9 



