The aweser would be B properties and rare earth elements
 
        
                    
             
        
        
        
Hi there! 
Magnetism and fluorescence are both considered........
Answer : C 
Special physical properties 
        
             
        
        
        
To have the largest sample size also gives you more data, thus increasing the likelihood of accuracy
        
             
        
        
        
Doctors try to remove tumors from the body to prevent it from spreading and affecting other parts of the body.
        
                    
             
        
        
        
Answer:
The correct answer is option - e. all of the above are useful traits.
Explanation:
A cloning vector is a small segment of DNA that can be established stably in an individual organism and able to internalize a foreign DNA for cloning purposes. The cloning vector could be taken from different organisms such as plasmid of a bacterium, or DNA from a virus. A cloning vector must possess some characteristics -  
The cloning vector must be self-replicating ability in the host cells, it should be small in size with restriction site for the restriction endonuclease enzymes in it. The replication character of the vector should not interfere with the internalized DNA fragment. The presence of marker genes in the vector is also a property that is helpful in identifying of recombinant cells.
Thus, the correct answer is option - e. all of the above are useful traits.