Answer:
I looked for a picture of what you were talking about and I think I found the answer
Explanation:
If this is the picture then I think its the first choice
 
        
                    
             
        
        
        
Wait this is highschool biology?! 
Woah... thought it would be harder....
Anyways, see "micro" means really small, so small that your bare eyesight can't take it (or see it, I don't care). A microscope was meant to see things that our eyes can't. Since humans cant see microlife we use a microscope. 
Mind Blown...
        
             
        
        
        
Answer: no idea if its true aka my answer
Explanation:  a measure of its biodiversity.
 
 
        
             
        
        
        
The Foramen (Meaning Opening) Magnum (Meaning Large) is a large opening at the base of the skull that the spinal cord passes through to connect the lower body to the brain.  The Foramen Magnum is<span> one of the several foramina found in the base of the skull.</span>