Answer:
Im not 100% sure but I believe the answer is A
Explanation:
 
        
             
        
        
        
Simplest to complex: atoms, molecules, cells, tissue, organs, organ system, organism
I hope this helps!
        
             
        
        
        
This is true hope this helps
        
             
        
        
        
Answer: It is a technique used to amplify a segment of DNA of interest or produce lots and lots of copies. In other words, PCR enables you to produce millions of copies of a specific DNA sequence from an initially small sample – sometimes even a single copy. (looked it up on google lol)