I believe that the answer is A, if I am not mistaken!
        
                    
             
        
        
        
Answer:
You answer is A
Explanation:
A combination of high salinity and low temperature near the surface makes seawater dense enough to sink into the deep ocean. Hopefully this help if it didnt my bad
 
        
             
        
        
        
Answer:
Crocodiles are actually the closest living relatives to birds
 
        
             
        
        
        
Answer:
If your blood pH levels aren't regulated then your blood will be like acid and potentially be fatal.
Explanation:
Your body tries to maintain homeostasis so regulating blood pH levels is vital.