Science

2. Treatment with a vaccine to produce immunity against a disease.
4. Any substance that induces the immune system to produce antibodies against it.
6. Microscopic organisms not visible to the naked eye. And can live in a variety of environments, from hot water to ice.
8. Having a sickness that can be passed to someone else.
11. The invasion and growth of germs in the body.
13. Chemical messengers that regulate processes in our body.
14. They are responsible for breaking down organic matter and releasing carbon, oxygen, nitrogen, and phosphorus into the soil and the atmosphere.
15. An automatic, action that your body does in response to something

1. An organism that lives in or on an organism of another species and benefits by deriving nutrients at the other's expense.
3. Also known as the peripheral nervous system.
5. A widespread occurrence of an infectious disease in a community at a particular time.
7. Used to treat or prevent some types of bacterial infection.
9. The fundamental units of the brain and nervous system.
10. An infective agent that typically consists of a nucleic acid molecule in a protein coat.
12. The largest part of the brain and is composed of right and left hemispheres