Final answer:
Positive feedback has an amplifying effect and enhances processes, like blood clotting, whereas negative feedback has a dampening effect and maintains stability, such as lowering blood glucose levels.
Step-by-step explanation:
The kind of input that is considered positive feedback typically has an amplifying effect on a system, meaning it enhances the production or effect of a substance or a process. An example of positive feedback is blood clotting after an injury, where the clotting process leads to further clotting until the injury is sealed. On the other hand, negative feedback typically has a dampening effect, serves to maintain a stable equilibrium, and involves a reaction in the direction opposite the stimulus to perform a corrective action, such as the lowering of blood glucose after a meal. Both feedback mechanisms are crucial for maintaining homeostasis within biological systems.