Answer:
the food web
Explanation: A food web is a conceptual model that represents the flow of energy through an ecosystem.
 
        
             
        
        
        
 We need a picture to answer your question
        
             
        
        
        
Answer: D. at most 10
Explanation:
Using the energy pyramid, the ratio of grassland to primary consumer to secondary consumer is: 100:10:1 respectively. 
Thus if the grassland supports 100 cattle (primary consumer), the numbers of humans (secondary consumer) the cattle can feed will be;
100/10 = 10.
 
        
             
        
        
        
Your question is unclear, but I will answer based on what information you have given. 
The rectangular prism has a base with an area of 81 meters squared. If the prism’s base is a square, than the dimensions of the object would be 10x9x9.
        
             
        
        
        
Clearcutting results in the removal of topsoil and some animal habits, which can prevent the forest from being able to grow again. While it is cheap, the damage to the food chain and surrounding ecosystem can destroy entire regions.