Biology

What are the tiny air sacs in the lungs called?

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Which of following words means "to die"?
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What type of blood cell helps fight and eat germs?
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What is a group of animals of the same species living and working together called?
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What habitat do caribou live in?
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A group of which insects is called an army or a colony?
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What does an ornithologist study?
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Which of these words means "to find a new home"?
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Trisomy-21 is popularly known as what?
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