Biology

What are the tiny air sacs in the lungs called?

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Dolphins are classified in the same order as what?
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Which of these animals goes through incomplete metamorphosis?
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What body system is the human heart part of?
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What are scientists who study animals called?
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Which of following words means "to die"?
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What nutrient do girls need more of than boys when they are growing?
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What is a period without growth called in a plant?
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Which of these is not part of a plant?
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