Answer:
Secondary succession
Explanation:
A secondary succession is when a type of disturbance happens when there is <em>already </em>soil present. In this case, it has already started out with a forest (including plants, trees, and wildlife). Other examples of a secondary succession include a wildfire, hurricane, flood, or human destruction. 
This is different from a <em>primary succession</em>. A primary succession occurs when  there is <em>no</em> soil present. 
 
        
             
        
        
        
B) the decay of once-living things
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Essential amino acids refer to the eight amino acids the adult body needs, which they cannot be synthesized correctly or at all. 
The essential amino acids must be obtained from food such as proteins (meats, seafood, milk, eggs, etc).
        
                    
             
        
        
        
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