Contour Strip Cropping or Farming 



The growing of crops on the strips between contour lines, 

 at right angles to the slope. Strips of grass or other plants may 

 be grown in alternation with the cultivated crops. A con- 

 servation practice to control or eliminate runoff and erosion, 

 and permit greater infiltration of water. 



Control Factor 



The chief limiting factor or condition influencing an or- 

 ganism, e. g., wilting of a plant caused by insufficient soil 

 water. 



Control Flume 



An open conduit or artificial channel arranged for meas- 

 uring the flow of water. 



Controlled Burning 



See Prescribed burning. 



Convergence 



The increase in similarity of different Seres as Succession 

 proceeds from early to late stages. 



Convergent Evolution 



The development of similarity in characteristics of or- 

 ganisms that were originally more different. 



Cooperation 



The kind of reaction between organisms which are bene- 

 ficial and non-obligatory to those participating, cf. Disopera- 

 tion, Protocooperation, Coaction. 



Copepod 



An animal in the order Copepoda, minute Crustaceans 

 in salt and fresh water. 



Coppice 



A grove in which the trees are regularly cut, new growth 

 arising from the base. 



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