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Why is the sun necessary to all organisms in an ecoystem?

Updated: 8/21/2019
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7y ago

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Second Law of Thermodynamics. Roughly speaking, to get ANYTHING done, you need to have available energy. All machines, but also all life forms, need energy.The Sun is the ONLY significant source of freely available energy here on Earth. Most other forms of energy (including wind, potential energy from falling water, etc.) derive from solar energy. The few other forms of energy are either not significant, or are difficult to access for living beings.

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Q: Why is the sun necessary to all organisms in an ecoystem?
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