Answer: 
<em>C. the nation, and since then,</em>
Exclamation: If you're joining two sentences together you need a comma to do so. By placing a comma after "nation" and "then" you are making a run-on sentence.
 
        
                    
             
        
        
        
Answer:
"greatest figure in ancient in astronomy" , "he gathered up the wisdom" , "illumined it with his theories" , "astonishing verisimilitude to the actual act"
Explanation: I got the correct answer from PLATO. 
 
        
                    
             
        
        
        
A large percentage of high-income<span> households and organizations. Is our answer!!</span>
        
                    
             
        
        
        
It'd be best if you looked it up on google, because then you could write it in your own words instead of having your teacher find out you got your answer off here, i don't want you to get in trouble
        
             
        
        
        
It comes from the heart, you have to be brave and strong to have courage.