Answer:
C and D
Ocean acidity was greater in 2010 than in 2000.
Heart disease is the major cause of death in the United States.
Explanation:
just took the question and those are the only two that are correct.
 
        
                    
             
        
        
        
T-cells are a type of white blood cell that circulate around our bodies, scanning for cellular abnormalities and infections.
        
             
        
        
        
The parent cells are diploid.