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 Butterflies are not only colorful flying works of art but they also hugely contribute to our environment by pollinating plants.  Sadly, their numbers are declining, as a decades-long study in the US has just disclosed.   The study, led by Tyson Wepprich of Oregon State University, discovered that numbers of common butterflies in Ohio state have dropped by 2 percent yearly, resulting in a 33 percent dip within two decades  

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