tinental Faunas according to P. J. Darlington, Jr., e.g., 



Megagea (Arctogea), Neogea, Notogea (q. v.). 



Recapitulation 



The theory that in the development of an individual 

 the stages of earlier forms in its evolution are repeated, 

 e.g., gill slits in the embryo of a pig. cf. Palingenesis. 



Recessive 



Refers to a Gene that has no effect on the appearance of 

 an organism unless it is Homozygous (q. v.), i.e., the domi- 

 nant gene is not present, cf. Allele. 



Redox-potential 



See Oxidation-reduction potential. 



Red Tide 



See Dino flagellate. 



Reduction Division 



See Meiosis. 



Reed Swamp 



A community of plants such as cattail or bulrush that 

 grows in shallow water and often extends landward on wet 

 soil where the water table is near the surface. 



Reef 



A series of rocks close to the surface of a body of water, 

 may be exposed at low tide. 



Reflex 



An innate, simple, stereotyped response, located in the 

 nervous system, occurring very shortly after the stimulus has 

 been received by an animal. 



Reforestation 



The establishment of a forest on previously cleared land, 

 cf. Afforestation. 



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