Science

What makes up about 70 percent of most living things?

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What instrument is used to look far-away objects?
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Orange juice is a good source of which vitamin?
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The four engines of a Boeing 747 jet produce 188,000 pounds (85,275 kilograms) of what?
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What was the first sound-recording device called?
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Which college features the Dooley Planetarium?
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Which of these animals is a mammal?
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What do our bodies need from the air we breathe?
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What is the opening of a lens, which controls the amount of light?
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