Biology

What is most of the oxygen that enters the human body taken in through?

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What is the name of the tube that carries blood to the heart?
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Which of the following is the largest group directly under kingdoms?
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Which is a change in the environment that brings a response?
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What kind of tree loses all its leaves during a dormant period like winter?
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What is a loss of water called?
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What process does a starfish use to grow a new organism when it is cut into pieces?
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What light-sensitive cells in the eye detect colors?
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Which of these words means "to find a new home"?
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