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The —- is our principal source of energy...

The —- is our principal source of energy.

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**Step-by-Step Solution:** 1. **Identify the Question**: The question asks for the principal source of energy. 2. **Recall Basic Knowledge**: Think about the various sources of energy available on Earth. Consider natural sources like fossil fuels, wind, water, and the sun. 3. **Determine the Most Important Source**: Among these sources, the sun is the most significant because it provides energy that supports life and various energy forms. ...
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