A. Centrifuge had the biggest impact on the development of the cell theory
        
             
        
        
        
Two thirds is equal to four sixths
        
                    
             
        
        
        
Answer:
4 .c is the right answer
Step-by-step explanation:
16=100% 
20÷16=1.25 or 125% 
125%-100%= 25% increase
 
        
                    
             
        
        
        
C=pid
Since d=9m and pi=3.142, C=3.142*9m=28.278
Rounded to 1 decimal point =28.3
        
             
        
        
        
Answer:
6 weeks = a (1 year)^2 52 weeks