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    causes for the decline of the songbirds

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    Many migratory songbirds, such as warblers, are declining. Evidence suggests that some of these birds might be victims of pesticides. Most of the pesticides implicated in songbird mortality have not been used in the United States since the 1970s. I suggest a hypothesis to explain the current decline in songbird numbers. I also design an experiment that could test the hypothesis.

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    There can be many causes for the decline of the songbirds. One hypothesis is that pollution or other man-made chemicals are affecting their food supply, either decreasing their food supply or becoming toxic once they consume insects and other food sources that became contaminated with such chemicals.

    To test this hypothesis, one should make ...

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    Causes for the decline of the songbirds