Explanation:
SARS, Ebola, swine flu, rabies
 
        
                    
             
        
        
        
Answer:
A 40 percent
Explanation:
If guanine is 10 percent this means that cytosine will also be 10.thats a total of 20 percent. We will then have 80 percent remaining for thymine and adenine. As we know adenine make a bond with thymine so 80 divide by 2 is 40 percent for each 
 
        
             
        
        
        
Answer:
Ocean phytoplankton produce almost half of earth's atmospheric oxygen 
 
        
                    
             
        
        
        
Answer:
The last two points are true
Explanation:
Mutations are harmful and beneficial but can also be neutral
Mutations do cause a variation of given poulation