Approx. 27 years i really hope this helped!!
        
             
        
        
        
For a person with blood type A- (A negative),  they can be transfused with either  blood type A negative  , or blood type O negative.
This is because any other blood type will immediately be rejected by their body.
A person with blood type A negative has got antibodies against any other blood type which has a rhesus positive factor as well as antibodies against  any other blood type of a different group such as B and AB, even if they are  rhesus negative.
Therefore because of the rhesus negative factor, a person with blood type A negative  can only be transfused with rhesus negative .
 
        
             
        
        
        
The best answer is C.
Chloroplasts are not found in all eukaryotic cells but only in plant cells. Animal cells are eukaryotic in nature but animals do not have chloroplasts in their cells because they do not engage in photosynthesis. 
Photosynthesis is the process by which plants make their own food. Chloroplasts  contain chlorophyll which is essential in t trapping sunlight from which supplies the energy for photosynthesis. 
Animals do not make their own food like plants but eat ready made food so their cells  lack mechanisms for food manufacture.
 
        
             
        
        
        
Carbon Monoxide.  Carbon Monoxide is polluting the air not water, everything else on the list is something that can pollute the water.