Answer:
 D. the proper replacement unit for one joule per second 
Explanation:
When energy is divided by the time the energy was used we get power



So, the answer is D. the proper replacement unit for one joule per second
 
        
             
        
        
        
The answers is 
D. The acid creates cracks in the rocks, which
allow air to circulate through the rock,
causing it to weather
        
             
        
        
        
Answer:
A and c, hope i helped xx
Explanation:
 
        
                    
             
        
        
        
car suspension
guitar string
clips for hanging clothes
keyboards buttons
elevators