Biology

What are the tiny air sacs in the lungs called?

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What insect looks like a twig on a branch, bush or tree?
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What are animals that have no backbones called?
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What is a reddish-orange pigment found in fruits, vegetables, and other plants?
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What is the nerve that helps transmit sound signals to your brain?
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Which is the sheet-like muscle at the bottom of a human chest?
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What type of system circulates blood around the body?
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What is the sprouting of a new plant structure called?
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Trisomy-21 is popularly known as what?
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