Nests, small organisms such as lizards, snakes, small birds, rock formations, skeletons of small animals.
        
             
        
        
        
Answer:
A
Explanation:
 it holds water in the plant 
 
        
             
        
        
        
Answer:  because the interactions between these organisms enable the cyclic flow of energy and nutrients in the ecosystem.
Explanation:
 
        
             
        
        
        
The activation energy of a chemical reaction is closely related to its rate. Specifically, the higher the activation energy, the slower the chemical reaction will be. This is because molecules can only complete the reaction once they have reached the top of the activation energy barrier.