Biology

What does the sea urchin use to help protect itself?

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What "trapdoor" on your windpipe helps keep out food particles?
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Which of the following was a category of organizing plants according to Aristotle?
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What is another name for the voice box?
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Which of these senses do you use to tell what color an object is?
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Which of these animals lives in the Arctic?
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What embryological experiment was performed by Hilde Proescholdt?
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What is the leaf of a fern called?
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What type of plants has tube-like cells that help move water through the plant?
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