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Across 1. the ability to continue living 3. to bring back to life again 6. a tablet of substances that are thought to promote a healthy life 11. a piece of writing written by a person about his or her own life 13. a piece of writing about a person's life written by someone else 14. the study of the nervous system of living things and howit helps the living things learn and react 15. surgery on living animals; medical research that involves cutting into animals to study organs, parts, or diseases 17. the removal of living tissue from the body for diagnostic examination 18. a medicine used to save lives because it destroys harmful bacteria and cures infections 19. a person who studies living things

Down 1. a person who lives through a difficult event or experience 2. full of life; fun; lively; animated 4. 'las big as life"; brightly colored; daring 5. quality or state of being full of life; state of being full of energy 7. the study of living things 8. to bring something back after it declined in condition or popularity; to breathe new life into something 9. a diet thought to help people live longer because it focuses on natural foods 10. the zone of planet Earth where there is life (between the deep crust and the lower atmosphere) 12. how two different living organisms live together and depend on each other 16. necessary or essential to life