Common examples of this would be if you place your hand in extremely warm or cold water, and an immediate response of pulling out of the water or any fluid, is an example of this extreme response, other responses are what is done in everyday, like being thirsty or hungry etc. 
These behaviours are shared by all organisms even the most simple ones.
        
             
        
        
        
It’s because unlike twins the regular siblings aren’t born on the same date or a couple minutes apart, but rather a couple years old or younger.
        
             
        
        
        
The producers at the beginning of the Earth's food chain are plants.
        
             
        
        
        
Answer:
1.It helps to digest our food.
2.It is used as antibiotics to treat bacterial infection and disease. 
3.It is used by humans to create food products such as cheese, yoghurt, pickles, soy sauce and vinegar.
4.It is use to break down our sewage and to clean up oil spills..