Answer:
http://www.realmonstrosities.com/2011/01/dobsonfly.html
Explanation:
It's on the webpage, I hope that works
 
        
             
        
        
        
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Answer: 
- They are made of denser objects, which can condense at relatively high temperatures;
- They are made of heavier elements, which have a stronger gravitational attraction to the Sun;
 
        
             
        
        
        
A common cold i believe .