Can someone please describe what is meant by positive and negative feedback loops?

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Can someone please describe what is meant by positive and negative feedback loops?

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A positive feedback loop is when a biological system detects a change, and rather than opposing the change, amplifies the change (such as giving birth), whereas the more common negative feedback loops are when the biological system detects a change, and tries to oppose it (such as shivering when cold). Negative feedback loops are much more common.

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