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OpenStudy (anonymous):
Ken enjoys bird watching. Every summer, he sees many ruby-throated hummingbirds in his garden. However, during the winter, he never sees any ruby-throated hummingbirds. Which of the following is a testable hypothesis that Ken could make to explain the winter absence of the hummingbirds?
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OpenStudy (wolfe8):
Welcome to OpenStudy. What follows? Also, look up bird migration.
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