Answer: Option C.
Population density is the total number of organisms within a fixed area.
Explanation:
Population density is the total number of organisms per unit area. Population density is calculated by dividing the number of organisms by the unit area either in square kilometers, squaremeters, square miles.
Population density =number of organisms ÷ unit of land area.
 
        
             
        
        
        
Answer:
B)an amine group, a functional R group, and a carboxyl group
Explanation:
 
        
             
        
        
        
Answer:
C
Explanation:
Nearsightedness is what happens when the image does not reach the retina whereas farsightedness happens when light is focused beyond the retina. 
 
        
             
        
        
        
Answer:
Due to the large number of fossils being discovered at that time Darwin proposed that species change over long periods of time.
Explanation:
The theory of Darwin was that the species change in accordance to their environment, thus they develop advantageous traits so that they can be more competitive.