Alleles. Alleles are the "same" genes, but provide a variation of the intended function. 
        
                    
             
        
        
        
The disappearance of the deer from the forest indicates the EXTINCTION OF THE DEER.
The extinction of the deer from the forest will throw the ecosystem out of balance and has negative impacts on the ecosystem. After all the deer has been eliminated, the elephants too will either have to find another source of  food or be wiped out.
        
                    
             
        
        
        
 <span>A flashlight is to battery as your body is to: FOOD.</span>
        
                    
             
        
        
        
Answer:
Option C. As microscopes became more powerful, scientists could see additional structures and functions within the cell.
Explanation: 
Light microscope is also called optical microscope which is used to see very small objects which can't be seen through naked eyes. The magnification power of light microscope is 1000x which means light microscope show the object 1000 times greater than its original size. Due to this magnification power, scientists are able to see many new features of the cell which cannot be seen with ordinary microscope. 
 
        
             
        
        
        
Answer:
b im pretty sure 
Explanation:
Population density is the average number of individuals in a population per unit of area or volume. For example, a population of 100 insects that live in an area of 100 square meters has a density of 1 insect per square meter.