Penicillin was made to help soldiers
        
                    
             
        
        
        
The answer would be between b and d but i would go with d
        
                    
             
        
        
        
Answer:
Trophic cascades are powerful indirect interactions that can control entire ecosystems. Trophic cascades occur when predators limit the density and/or behavior of their prey and thereby enhance survival of the next lower trophic level.
Explanation:
 
        
                    
             
        
        
        
60 hope this helps mark as brain lists