Biology, 30.08.2021 23:20 alexa2007

A scientist wants to see if there are less butterflies in places where people spray for mosquitoes. He finds thirty yards where people spray for mosquitoes every week. He visits the yards for one hour every week and counts all
the butterflies he sees. There aren't very many

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A scientist wants to see if there are less butterflies in places where people spray for mosquitoes....