B.  the speed of the water
Explanation:
The independent variable here is the speed of the water being poured through the tube. 
An independent variable is the variable is the whose change does not rely on another. 
- The speed of the water is the cause of the sand deposition. 
- This is the independent variable. 
- The quantity of sand that is deposited is the dependent variable. 
- It relies on the speed of the water. 
- The dependent variable is the effect of the speed of water being poured. 
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They come in a variety of different trees such as maple trees, pine trees, and English oak trees.
        
             
        
        
        
Answer:
maybe the state of Alaska tourism website would be a good source for researching a vacation to Alaska. It might work
Explanation:
 
        
             
        
        
        
Cells of various types have different functions because cell structure and function are closely related. It is apparent that a cell that is very thin is not well suited for a protective function.