All people are equal and that the colonies were now free and independant states
        
                    
             
        
        
        
A mockingbird symbolizes innocent. Harper Lee probably has Jem and Scout hear a mockingbird as they're walking to their school alone because through the story they symbolize the innocence of youth, sheltered in their community. The action of the novel has them experiencing things far beyond what they ever have before and trying to maintain their innocence. 
        
             
        
        
        
The best answer in this case is the last one - a software package which retrieves information from any or all avaliable internet servers. 
This is correct because when you think about it, this is exactly what a web browser does. You type a certain webpage's home address and it returns you the information stored about this webpage on a server where it is hosted :)
        
             
        
        
        
He kept him in the house and did not often let him go out.
        
             
        
        
        
The proffesor will grade her paper by evaluating the criteria as listed on the rubric.