Final answer:
One of the early symptoms of carbon monoxide poisoning is a headache, which is accompanied by nausea, dizziness, and confusion.
Step-by-step explanation:
One of the early symptoms of carbon monoxide poisoning is a headache. Other early symptoms include nausea, dizziness, and confusion. Carbon monoxide is a colorless, odorless gas that interferes with the delivery of oxygen throughout the body. It is important to be aware of these symptoms and take immediate action if carbon monoxide poisoning is suspected.