3780 km.
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I need more details like r u reading from something 
        
             
        
        
        
Gravitational energy is a form of potential energy because it is dependent on the mass of an object and needs to be calculated for the specific object.
        
             
        
        
        
Answer:
I would have to go with A, or maybe....yea A
 
        
                    
             
        
        
        
Answer:
Option (D)
Explanation:
The velocity at which blood flows in the blood vessels is inversely proportional to the total cross-sectional area of the blood vessels present in the body. This means that if the cross sectional area of the vessels low, then there will be high rate of blood flow, and vice versa. This blood flow is minimum in the case of capillaries, where it gets enough time for the exchanging of essential nutrients as well as gases.
Thus, the correct answer is option (D).