The lens used in a magnifying glass are called convex lens.
When coal is burned, chemical potential energy is transformed into thermal energy, light energy, and sound energy. Therefore only the thermal energy is used for their electricity production.
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Once you make the hypothesis, you need to check if it's true. So your answer would be C!
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The answer C because scientists use graphs. tables to organize and write down their data
They all divide people into different social groups.