Oxygen and silicon make up most of earths crust 
        
             
        
        
        
The effect of glucagon can get you nausea, vomiting, headaces, rhinorrhea and nasal pain.
        
             
        
        
        
The correct answer should be The ability to reproduce only within a species.
 
        
                    
             
        
        
        
Answer:
C
Explanation:
Remember that a niche is an inhabited areas where organisms essentially behave a little like humans each filling their own individual role. These aren't extremely common to find but the whole concept of it is that these organisms will function peacefully and trying to help one another survive. C is correct because with minimal resources you will lose that sense of tranquility and now fight it out for who is the fittest for the environment
Hope this helps!