I think its because when your upside down, your not breathing right. So its a way of trying to breathe correctly. 
        
             
        
        
        
O D the seasonal movement of organisms between locations mark me as brilliants
        
             
        
        
        
Answer:
The input or x value= spf
The output or y value= Minutes of exposure until sunburn
 
        
             
        
        
        
It’s in the picture so They travel slower than p waves, they result in much ground motion, they are produced by p and s waves