Answer:
2) B
3) D
I believe that these are the answers, I hope this helps! 
 
        
                    
             
        
        
        
Speed is the rate of change in distance.
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Answer:
B) cytoskeleton
Explanation:
the cytoskeleton is a network of connected filaments and tubules.
 
        
             
        
        
        
A decomposition reaction occurs when ionic or covalent bonds are broken and elements and or ions or simpler molecules are formed.