Hello,
PCR is a useful technique because it is used to amplify small segments of DNA.
Thanks,
        
             
        
        
        
The correct answer is all of them: 
<span>A.is only found in eukaryotes
B.is found in the nucleus of prokaryotes
C.controls the physical traits of an organism
D.determines the sequence of amino acids in proteins
E.can control certain organism behavior
F.is a long, single chain of paired nucleotides</span>
        
             
        
        
        
Its a thing used in photosynthesis <span />
        
                    
             
        
        
        
Closed-ended questions<span> are those which can be answered by a simple "yes" or "no," while </span>open-ended questions<span> are those which require more thought and more than a simple one-word answer.</span>
        
             
        
        
        
Answer:
Option). 4-5 days.
Explanation:
Morula is a 4-5 days stage of early embryonic development. It represents a solid ball, having 16 cells, known as blastomeres. In human embryo, differentiation begins with morula stage, along with cleavage to form trophoblast (an outer layers of cell) and inner cell mass. 
During development, trophoblast forms embryonic part of placenta and inner cell mass form respective structures of embryo.
Thus, the correct answer is option).4-5 days.