Biology

What substance is produced by flowers and sometimes causes hay fever?

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What organ filters blood and helps regulate salt and water levels?
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Which of the following human traits can be used, like fingerprints, for identification?
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What nutrient group is sugar in?
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What part of the human skeleton protects the brain?
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What is the gestation period of the African elephant?
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What is most of the oxygen that enters the human body taken in through?
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Which of the following is biologically classified as an insect?
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Which insect is known for its sting?
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