There are both physical and biological limiting factors found in nature.
-Physical factors (abiotic factors) include temperature, water availability, oxygen, salinity, light, food and nutrients. 
-Biological factors (biotic factors) involve interactions between organisms such as predation, competition, parasitism and 
herbivory.
        
             
        
        
        
I believe it is c 100x because you multiply the 10 by the power of the eye piece which is usually 10 and 10 multiplied by 10 is 100
 
        
             
        
        
        
Atomic #= 16
Mass=32.06
Neutrons=16 (subtract the atomic number by the mass(32-16=16))
Non metal
        
             
        
        
        
Yes they are alive in numbers today and they are known as one of the most top shark killers there are, other than the great white shark and killer whales. *there is a pic below of the shark, I take no credit for it, I just found it off google.