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provides light energy to the firsts of almost all food chains (excludes vent communities) which are the plants for photosynthesis

The sun provides three things for life to occur on earth.
1. Heat. With out the heat, no life could survive.
2. Energy. Plants can combine the energy in the sun with water and minerals in the soil to produce their own food. All other life depends on plants at some level for their food in the food chain.
3. Light. With out the light from the sun, if life did some how manage to exist, it would be pitch black except for the light of distant stars. The moon would obviously be completely dark too.

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