Final answer:
The answer is d) uterine contractions during labor.
Step-by-step explanation:
The answer to the question "Which is an example of negative feedback?" is d) uterine contractions during labor. Negative feedback is a regulatory mechanism in which the response opposes the initial stimulus, maintaining a steady state. In the case of uterine contractions during labor, the contractions of the uterus trigger the release of oxytocin, which further stimulates more contractions. This positive feedback loop continues until the birth of the baby.