It's controversial because the best source of stem cells is a human embryo (an aborted fetus).
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<h2>I think, dead zoning is answer. </h2>
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<h2>Hope it helps you.</h2>
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Changing energy to clean energy. This solution gave me some hope because we would stop using non-renewable resources, which are harmful to the environment.
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I think it's " P waves from earthquakes can travel through both solids and liquids so they tell us what is inside the earth. "
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