P-4 



PROFUNDAL ZONE 



The deep, bottom-water area beyond the depth 

 of effective light penetration. All of the 

 lake floor beneath the hypolimnion . 



PROLIFIC 



Pertaining to organisms that have a high 

 reproduction rate and normally produce large 

 numbers of young. 



PROTOPLASM 



The living material in cells of plants and 

 animals . 



PUPA 



An intermediate, usually quiescent , form 

 following the larval stage in insects, and 

 maintained until metamorphosis to the 

 adult stage. (See Larva) 



