C. Keep records of trade.  The quipu was made of knotted string and the Incas would keep records of birth, death, and harvests.
        
             
        
        
        
Are there any choices for this qeustion?
        
             
        
        
        
Answer:
I labeled the answers in order for each question. Have a good day!
Explanation:
1. Founded
2. Devoted
3. Benefited
4. Eventually
5.acquire
6. Innovation
 
        
             
        
        
        
There's three possible answers I found. The first one being that they worked in a bike shop, the second is that they were self taught, and the third is that there was this guy named Charlie Taylor who worked for them and he pretty much built the engine of their first planes
        
             
        
        
        
Economic issues in general are the issue.