Answer the following question: Fact 1: Endocrine hormones travel throughout the body in the blood. Fact 2: Hormones are the chemical messengers of the body's endocrine system. Given the two facts above, what travels throughout the body in the blood?

Choose your answer from: 1. chemical messengers 2. carbon monoxide 3. Veins and arteries. 4. bacterial messengers 5. density 6. kinetic energy 7. electromagnetic energy 8. matter vibrating
Answer:
1.