<span>The situation is one similar to the development of antibiotic resistance. The initial five years of spraying wiped out most of the pests; however, the killing also helped the pesticide-resistant pests to survive and thrive since they had less competition. Over the period of five years, the pesticide resistance became more and more common among the beetles and in the eighth year, almost all of the beetles were resistant to the pesticide. Thus, the answer is D.</span>
        
                    
             
        
        
        
C. have students record homework time in a class data table everyday , tally up the time, and make a bar graph contrasting male and female work times
        
                    
             
        
        
        
The answer is would be -- Clam shells found within the rock sample. 
        
             
        
        
        
From Pollution you know smokes
        
                    
             
        
        
        
The two types of microscopes are electron and optical microscopes. 
Electron microscopes have a higher magnifying power since it uses lighting technology to do so.
Hope it helped,
Happy homework/ study/ exam!