Answer:
A. What causes some people to be color-blind?
Explanation:
This is something that could be tested with different variables including DNA, or past family medical history.
 
        
             
        
        
        
Answer:
that would be C, seafloor spreading occurs!
Explanation:
 
        
             
        
        
        
A, it takes years upon years for a glacier to move even a few feet.