Across
- 3. a medicine used to save lives because it destroys harmful bacteria and cures infections
- 5. the zone of planet Earth where there is life
- 7. the study of living things
- 8. a piece of writing about a person's life written by someone else
- 9. how two different living organisms live together and depend
Down
- 1. a diet thought to help people live longer because it focuses on natural foods
- 2. the removal of living tissue from the body for diagnostic examination
- 3. a piece of writing written by a person about his or her own life
- 4. each other
- 6. the study of the nervous system of living things and how it helps the living things learn and react
- 7. a person who studies living things