Answer:
The given blank can be filled with latent content. 
Explanation:
The latent content signifies the hidden meaning of a dream, that is, present behind the dream's literal content. On the basis of Freud, a dream's latent content signifies the hidden psychological meaning of the dream.  
Freud considered that the content of the dreams is associated with fulfillment of wish and recommended that dreams possess two kinds of content. These are latent content and manifest content. The actual literal subject matter of the dream is known as the manifest content, while the underlying significance of these symbols is the latent content.  
 
        
             
        
        
        
Scientific advancement has increased food safety by the use of preservatives, refrigeration, better packaging, labels with expiration dates...that's a good many right there!
        
             
        
        
        
The total amount of living tissue within a given tropic level is called the biomass