They will not mix because the oil does not have a chemical charge large enough to break the hydrogen bonds between the water molecules.  
        
             
        
        
        
Hope this helps!
Estrogen is made out of steroid hormones
 
        
        
        
Could cause loss of animal habitats or more animals can become extinct because the more we built the more we are pushing them from there homes.
        
             
        
        
        
The best answer would be:
Unconditioned stimulus
In Pavlov's experiment on conditioning the food was the unconditioned stimulus that triggers a reflex or natural behavior. Think of it like something that makes you do something automatically. 
For example, the food. When the dog smells food, it salivates. This is unconditioned because without teaching the dog, it automatically responds by salivating.