Which type of feedback amplifies changes in a biological system?

Positive feedback amplifies changes in a biological system by enhancing the direction of the change rather than counteracting it. This mechanism occurs when an initial stimulus produces a response that increases the original effect, thus creating a cycle of enhancement. A classic example of positive feedback is during childbirth, where the release of oxytocin increases contractions, leading to more oxytocin release until the baby is delivered. This process is crucial in situations where a rapid and decisive change is necessary.

In contrast, negative feedback mechanisms serve to maintain homeostasis by counteracting deviations from a set point, effectively working to stabilize the system. Concepts like homeostatic feedback and adaptive feedback generally imply processes that aim to correct and stabilize a biological function rather than amplify change. Therefore, when considering the amplification of changes, positive feedback is the key mechanism that stands out.