1. The _____________ is the collection of microorganisms that colonize our bodies.

2. Which location of the body are microbe-free?

1. Blood
2. Brain
3. Spinal fluid
4. Mouth
5. Feet
6. Hair
7. colon
8. intestine
9. stomach
10. throat
11. hands
12. heart
13. left hand
14. right hand
15. genitals

3. Which are true about the dynamics of the microbiome?

1. Once you are colonized the species of bacteria remain identical throughout life.
2. Once you are colonized the species of bacteria change throughout life.
3. People are colonized only after they reach adulthood, then the species of bacteria colonizing the body remain identical throughout life.
4. People are colonized only after they reach adulthood, then the species of bacteria colonizing the body change throughout life.
5. Only people with active infections will be colonized by bacteria.

4. A mouse that has been kept "germ free" is termed a ____________ mouse.