Explanation:
I think the answer is contraceptive pills but not sure
 
        
             
        
        
        
The nucleus is an organelle found in eukaryotic cells. 
Hope this helped! 
        
             
        
        
        
It sweats. The sweat can cool the feet down... CAUSE THEY ARE ON FIRE
        
             
        
        
        
The answer is D, because it is a form of camouflage and an adaptation to the environment for self defense