Unit 23 Spelling Rules

3. Bacteria are small organisms, or living things, that can be found in all natural environments. They are made of a single cell. Most bacteria can be seen only with a microscope.
7. The cracking or breaking of a hard object or material.
8. Treatment with a vaccine to produce immunity against a disease; inoculation.
11. Lung inflammation caused by bacterial or viral infection.
12. (of a woman or female animal) having a child or young developing in the uterus.
13. An infective agent that typically consists of a nucleic acid molecule in a protein coat, is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host.
14. Part of the digestive system of the body, sometimes called the guts or bowels. This system deals with all the food and drink that you take into your body.
15. A part of an organism which is typically self-contained and has a specific vital function.

1. A tube-shaped sac attached to and opening into the lower end of the large intestine in humans and some other mammals.
2. A viral infection that attacks your respiratory system.
4. The part of the body of a vertebrate containing the digestive and reproductive organs; the belly.
5. A medical instrument for listening to the action of someone's heart or breathing.
6. The science or practice of the diagnosis, treatment, and prevention of disease.
9. The action of making a person or animal immune to infection, typically by inoculation.
10. A small case or container, especially a round or cylindrical one.