posted by Amy

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

  1. Rawr

    2: cycled between organisms and the environment

    The compounds must be taken in by consumption, and then recycled back through decomposition.

  2. maiaylah

    cycled between organisms and the environment

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