Answer:
separate DNA fragments according to their size.
Explanation:
Gel Electrophoresis of DNA demonstrates how DNA can be specifically cut into fragments by restriction enzymes and then can be separated by fragment size on an agarose gel.
 
        
             
        
        
        
The first answer is correct. rRNA makes up ribosomes along with other protiens. rRNA stands for ribosomal ribonucleic acid
        
                    
             
        
        
        
D. Chemical energy 
The plant converts solar energy into food for the plants. doing this would be a chemical reaction. At the end of photosynthesis there would be chemical energy. :)