Final answer:
Childbirth is an example of a physiological process that uses a positive feedback loop.
Step-by-step explanation:
Childbirth is an example of a physiological process that uses a positive feedback loop. In a positive feedback loop, the response to a stimulus leads to an increase in that stimulus, resulting in a greater response. In the case of childbirth, when the baby pushes against the woman's cervix, it stimulates contractions that push the baby further down the birth canal, leading to more pressure on the cervix and stronger contractions. This positive feedback loop continues until the baby is delivered.