Cuadro de texto: The discrete nature of organisms or chemical molecules is missed in general when a continuum approach (reaction-diffusion-advection) is used to model processes in Nature. This is specially important in situations close to extinctions, and other critical situations 
(but field models are usually better for analytical understanding …) Cuadro de texto: Need to formulate ‘Individual Based Models’ (IBMs), compare with continuum formulations,  
and understand the relations between both approaches. Cuadro de texto: THE INITIAL MOTIVATION …

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