Answer:
Sorry if I'm wrong but I think it's B
Explanation:
A population bottleneck or genetic bottleneck is a sharp reduction in the size of a population due to environmental events such as famines, earthquakes, floods, fires, disease, and droughts or human activities such as specicide and human population planning.
 
        
                    
             
        
        
        
Yes because as the population of Herons decrease, the population of frogs increase because there is less herons to eat the frogs. If the population of
        
             
        
        
        
Answer:Nitrogen is a crucially important component for all life. It is an important part of many cells and processes such as amino acids, proteins and even our DNA. It is also needed to make chlorophyll in plants, which is used in photosynthesis to make their food.
Explanation:
 
        
                    
             
        
        
        
DNA Ligase enzyme. 
Hope i helped! Please mark Brainliest if u can :)