please answer theses 4 questions. 4-5 sentences .

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1. Which type of feedback loop is most common in nature AND which more commonly results from human action?
2. Describe how hypoxic conditions can develop in ecosystems such as the Chesapeake Bay?
3. What role does each of the following play in the carbon cycle?
The Oceans:
4. How has human activity altered the csrbon cycle, the phosphorus cycle and the nitrogen cycle? Name at least two environmental problems that have arisen from these changes?
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