The most important source off all is WATER!
The main source of energy is usually considered to be the energy absorbed from the sun (E.G., used in photosynthesis).
The sun is the major source of energy in the desert as well as most other biomes on earth.
The energy we receive from the Sun.The energy we receive from the Sun.The energy we receive from the Sun.The energy we receive from the Sun.
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The sun Added: This is definitely true. Sunlight affects all surface and shallow water ecosystems. All though the sun provides us with a primary source of energy for almost all of earth's ecosystems, with proof of greenery from photosynthesis; this is not the case in such areas like the land of the Sahara desert and the Southwest climates of the USA. The lack of abundant water is another factor.
The main fate of energy is for it to be lost as heat.