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    Bicycle law quesiton in Oregon?

    Hey, I just started to get into bicycling, and was wondering if it is illegal to bike without a helmet in the state of Oregon? I'm in Portland if that matters.. I'm 20 years old. Thanks let me know!
  2. H

    Bicycle law quesiton in Oregon?

    Hey, I just started to get into bicycling, and was wondering if it is illegal to bike without a helmet in the state of Oregon? I'm in Portland if that matters.. I'm 20 years old. Thanks let me know!
  3. H

    Help me with this biology question!?

    two containers of water, A and B, contains different volumes of water. A contains a bigger volume of water than B, which one has more oxygen and why?
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