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My Answered Questions
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what planets have rings?
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When we age why does our hair grow grey or fall out and why do we get wrinkles?
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Why do we have eyebrows?
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what creates conduction?
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what makes a computer work?
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how is a seed made?
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what creates convection?
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how can we prevent global warming?
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how does tar get on your windpipe when you smoke?
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what are the main ways microbes are spread?