A series of logical steps followed to solve problems.
        
             
        
        
        
Answer:
B. Use the polymerase chain reaction (PCR) to make multiple copies of the DNA.
Explanation:
The scientist is to analyze a small sample of DNA, the most useful step to start this would be first the use of polymerase chain reaction to make various copies of that DNA sample. PCR is essential and quick process that gives a lot of copies within few hours. It uses the sample or target DNA, according to which the primers are designed. Taq polymerase and DNA polymerase are also used in the process, it consist of various cycles in which copies are made. There are three basic steps 'Denaturation', 'annealing', and 'extension'. 
 
        
             
        
        
        
Ww and O 75 is the answer
        
             
        
        
        
Answer: Homeostasis refers to the body’s ability to maintain a stable internal environment.
Explanation: Maintaining homeostasis requires that the body continuously monitors its internal conditions.
Hope this helped! :)