The amount of available resources in the ecosystem must change at a predictable rate.
 
        
                    
             
        
        
        
Saphrophytic nutrition is all about obtaining nutrients from non-living organic matter, usually dead and decaying plant or animal matter, by absorbing soluble organic compounds.
        
             
        
        
        
It gets polluted from fertilizers or any spilled chemicals. And those chemicals get obsorbed into the ground. And the gravity pushes them deeper in the soil, till it reaches the underground water (or aquifer)
 
 
        
             
        
        
        
Answer:
12 m^2
Explanation:
Area = length * width 
A = 4m * 3m
A = 12 m^2
(Area is measured in square units)