Vocabulary 23

3. surgery on living animals; medical research that involves cutting into animals to study organs, parts, or diseases
5. a piece of writing written by a person about his or her own life
8. "as big as life"; brightly colored; daring
10. to bring back to life again
11. a person who studies living things
13. diet a diet thought to help people live longer because it focuses on natural foods
15. necessary or essential to life
17. the removal of living tissue from the body for diagnostic examination
18. quality or state of being full of life; state of being full of energy
19. the zone of planet Earth where there is life (between the deep crust and the lower atmosphere)

1. the ability to continue living
2. a tablet of substances that are thought to promote a healthy life
4. a person who lives through a difficult event or experience
6. a medicine used to save lives because it destroys harmful bacteria and cures
7. to bring something back after it declined in condition or popularity; to breathe new life into something
9. the study of the nervous system of living things and how it helps the living things learn and react
11. the study of living things
12. how two different living organisms live together and depend on each other
14. a piece of writing about a person's life written by someone else
16. full of life; fun; lively; animated