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The sun is the main source of energy on earth simply because of food webs/chains and trophic levels. At the bottom of every food chain there is a primary producer, and these producers are almost always photosynthetic--meaning that they use light energy to synthesize sugars and other organic compounds. The next level on the food chain are the primary consumers (those that eat the primary producers), from there secondary consumers, tertiary consumers, quaternary consumers, etc. The important thing to remember though is that all energy comes from the primary consumers, the photosynthetic organisms. For an example: if you think of the primary producers as grass, than the primary consumers would be field crickets. The crickets eat the grass, the mice eat the crickets, the snake eats the mice the hawk eats the snake. But because every organism above the primary producer needs to obtain energy to survive that means that all the organisms rely on the primary producer; which itself relies on the sun for energy.

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Q: Why is the son known to be the source of energy for all organisms on earth?
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