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May 5, 2015

Homework Help: Biology-Ecology

Posted by Amy on Saturday, March 16, 2013 at 9:00pm.

Multiple choice:
For a natural ecosystem to be self-sustaining,
many compounds must be:
1. converted into new forms of energy.
2. cycled between organisms and the environment.
3. permanently removed from the environment.
4. changed into fossil fuels such as oil and
coal

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