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 right answer is check the girl's state of consciousness, talking to her and asking questions.

a conscious victim is able to answer questions. she does not tend to go to sleep and can follow your eyes. she is lucid and she can talk.

a semi-conscious victim is not able to answer clearly or correctly the questions asked. she does not seem fully awake and lucid. it gives the impression that it may fade from one moment to the next and it can also appear to be under the influence of drugs or alcohol.

an unconscious victim does not respond and does not respond to words or pain.