Answer:
if an animal lives in the desert and its moved to a cold place it can die cuz its not where it should be 
Explanation:
 
        
             
        
        
        
Hello,
Here is your answer:
The proper answer to this question is option A "determining point of diminishing returns"! That because the government uses that to get taxes back!
Your answer is A!
If you need any ore help feel free to ask me!
Hope this helps!
        
                    
             
        
        
        
If the inner lining of the air sacs neither thin nor highly vascularized, then it can be inferred that AIR SACS ARE CANNOT BE THE SITES OF GASEOUS EXCHANGE BETWEEN AIR AND BLOOD. Air sacs are generally lined with mucus and surrounded with blood capillaries. 
In case of birds, air sacs play an important role in respiratory system.