Answer:
A. Hemodialysis
Explanation:
Hemodialysis is the method or process of using a dialysis machine (a special machine) to clean the blood. 
This is done by doing a minor surgery on the patient to get the blood into the dialyzer.
This dialysis machine does the work a healthy kidney would do.
 
        
             
        
        
        
Answer:
Explanation:
Four conditions are needed for natural selection to occur: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population. 
ORR 
Struggle for existence, variation and inheritance. These are said to be the necessary and sufficient conditions for natural selection to occur.
 
        
             
        
        
        
Inductive reasoning    tanks!:)
        
                    
             
        
        
        
Answer: 2 electrons
Explanation:
The inner shell (1st shell) can hold 2 electrons, the next shell can hold 8 electrons and the third shell can hold 18 electrons.