Biology

What does the sea urchin use to help protect itself?

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What does an ornithologist study?
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What common food is actually a modified root?
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Which of these is a plant native to Asia?
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Which of the following would a doctor do to look at your bones?
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Which of the following is NOT a type of tooth?
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About how long is the human small intestine?
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Which of these is a part of blood?
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What are animals that have no backbones called?
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