What Is the Source of Energy for Most Ecosystems?

Answer

Plants need energy to make food and therefore most ecosystems source their energy from the sun. In an ecosystem, energy is passed on from one trophic level to another, for instance, from autotrophs to herbivores, from herbivores to carnivores and from carnivores to other carnivores.
Q&A Related to "What Is the Source of Energy for Most Ecosystems..."
producers.
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Basically, chemoautotrophs derive energy from chemical reactions that don't need light (unlike photosynthesis) This ability enables chemoautotrophs to live in some unusual environments
http://www.ehow.com/about_6681808_source-energy-ch...
I'll assume that the question refers to the most sustainable form of generation that is actually built in large quantities, sufficient to do something about global warming. In that
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the source of energy regardless of whether you're in a light or dark situation is chemical bonds. How you break those bonds is different, depending on your environment. In your case
http://answers.yahoo.com/question/index?qid=200910...
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