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    Ragweed is among the most common causes of outdoor allergies.

  • Answer 1/1

    Ragweed is among the most common causes of outdoor allergies.

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    Correct! Ragweed is widespread throughout the U.S. and a single ragweed plant can release a billion grains of pollen a season into the air. That makes for a lot of sneezing.

    Nice try! Ragweed is widespread throughout the U.S. and a single ragweed plant can release a billion grains of pollen a season into the air. That makes for a lot of sneezing.

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