To prevent or control transmission of infectious microorganisms from any source.
I had this question once.. Hope it helps.
 
        
             
        
        
        
1 mitochondria, 2 cell won't be replaced, 3 splits cells, 4 butterfly coral amoeba came from preexisting cells, 5 based on observation, 6 isn't there sorry
        
                    
             
        
        
        
1. C.
2.D.
3.I.
4.G.
5.J.
6.H.
7. J.
8.E.
9.J.
10.E.
11.F.
12.K.
13. G.
14.B.
15.H.
I'm not sure if all Letters had to be used. But I tried my best, sorry if some are wrong.
        
             
        
        
        
Answer:
A heart transplant is a surgery in which doctors remove a person's sick heart and replace it with a healthy donor heart. ... They choose to donate the organs because they want to help someone else who is sick.
Here's another example:
Mayo Clinic is the largest integrated transplant provider in the United States. Mayo Clinic has pre-eminent adult and pediatric transplant programs, offering heart, liver, kidney, pancreas, lung, hand, face, and blood and bone marrow transplant services. 
Have a nice day!