<span>tubulin, the microtubule protein</span>
        
             
        
        
        
koala
the koala lives in the forest Australia has no forests they all burnt down
 
        
             
        
        
        
The answer is All of above
        
             
        
        
        
If a person is "sterile", this means that they cannot reproduce. The word "sterilized" is essentially stating that there is no productive activity in order to be able to reproduce.