Final answer:
Administering 100 percent oxygen can save a patient from carbon monoxide poisoning by displacing carbon monoxide and restoring oxygen levels. Giving carbon dioxide would not be effective.
Step-by-step explanation:
Administering oxygen is crucial in certain medical situations. For example, when a patient is experiencing carbon monoxide poisoning, administering 100 percent oxygen can help to save the patient's life. This is because oxygen hastens the dissociation of carbon monoxide from carboxyhemoglobin, turning it back into hemoglobin. Giving carbon dioxide would not be effective because it does not have the same ability to displace carbon monoxide and restore oxygen levels.