^3 



c. 



d- ^r> 



e. 



¥^> 



g- 



h. 

 i. 



Source 



Primary producer 



Storage 



Consumer 



Detritus-microbe complex 



HZZ3- OR A 



Workgate 



Switch 

 Sensor 



Energy or material flows 



Figure 3-1. Modules of the energy circuit language. 



18 



