Biology

What is the outer skeleton of organisms such as spiders and insects called?

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Which of the following is alive?
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Which pair of animal species and types is correct?
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A single piece of coiled DNA is called what?
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Which animals have gills?
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From what tree did aspirin originally derive?
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Which of these changes the most from beginning to the adult stage of its life cycle?
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How many bones are in each finger, except the thumb, of a human hand?
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Which pair of animal species and type is correct?
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