Biology

What are the tiny air sacs in the lungs called?

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Which of these organs can grow back if some of it is removed?
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What vitamin does the sun's ultraviolet rays help the skin produce?
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What is the period of growth before birth called?
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What is another name for the human skull?
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Which of these African grassland animals shares a food source with the zebra?
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What takes up 50-70 percent of a whale's weight?
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What type of gas is provided by trees to help us breathe?
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The India rubber man at the carnival may be suspected of having what disease?
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