Which of these is an example of negative feedback?
1. as a blood clot begins to form, the process of its formation gets faster and faster.
2. after you eat, glucagon stimulates an increase in blood sugar levels.
3. after you eat, insulin stimulates the lowering of blood sugar levels.
4. the digestive enzyme pepsinogen is converted to pepsin by the action of hydrochloric acid; pepsin itself can then convert pepsinogen into pepsin.
5. once labor begins, contractions increase in frequency and intensity

3. After you eat, insulin stimulates the lowering of blood sugar levels

Explanation:When someone is eating ,blood sugar level increases that is an original stimulus however insulin release to the body reduces or lowers the blood sugar levels hence it comes as a secondary stimulus that reduces the effect of the first stimulus that is negative feedback.

Whereas positive feedback the opposite happens in which the first or original stimulus is further enhanced by the release of the second stimulus for example when someone is in labor they have contractions during this process a hormone known as oxytocin is released which enhances contractions and that is a positive feedback .

the maintenance of fluid balance during exercise. author information: fluid supplementation is necessary for exercise in which fluid losses must be offset by intake to avoid the negative effects of hypohydration on health and performance.

answer(d) call 911;