Answer: 
Sky Cover. The total amount of clouds in tenth. Plotted in the station circle according the ... The wind speed is plotted as feathers and half-feathers representing 10 and 5 knots, ... For values above 10 miles, the values are omitted from the map.
Explanation:
 
        
                    
             
        
        
        
The correct answer is - lung cancer.
The asbestos is a material that has been used very often in the past, mostly for making water pipes and roofs. Few decades ago it was proven that the asbestos actually breaks down into microscopic little pieces that are extremely dangerous. This little pieces, if inhaled, can gradually result in the development of a lung cancer. Because of what the research had shown, lot of people and institutions were in panic, so urgent and quick measures were taken in order to change the water pipes and the roofs.
 
        
             
        
        
        
Population#1: Humans
Population#2: Stink beetles