#19 due to weathering and erosion the rock from the stream was smoothened and without as much the rock from deep underground was/is very rugged and natural.
#18 Due to wind patterns the sand dunes are blew around and the sands shift and fly around with nothing to keep the sand in place the sand can go long distances or come long distances.
        
             
        
        
        
The answer is c because the calculations for the elements have to connect with the compounds
        
             
        
        
        
Answer:
Explanation: Nuclear fusion
 
        
                    
             
        
        
        
Answer:
Q.89
Alkane - CnH(2n+2)
given that 8 H = > 8= 2n+2 
 therefore n= 3 
C3H8 = 12×3 + 8×1= 36 +8 = 44
 
        
             
        
        
        
Enzyme- a substance produced by a living organism which acts as a catalyst to bring about a specific biochemical reaction
Inhibitor- a thing which inhibits someone or something