It is important to keep a microscope covered when not being used. Even when storing a microscope in a cabinet a dust cover must always be applied. By applying the dust cover to your microscope it prevent dust from getting in the eye lenses
I am not 100% sure but I believe that because of increased manufacturing, the air got very polluted and this made many trees darker, like birch. So moths are usually lighter in color so many couldn’t really hide among trees and they were eaten. After some time, many moths mutated and also became darker to blend in when they were on trees to prevent being eaten by predators. In conclusion, the population decreased.
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Through the process of Meiosis