Across
- 4. how two different living organisms live and depend on each other
- 8. a piece of writing about a person's life by another person
- 9. a diet thought so people can live longer
- 10. the part where there is life on Earth
Down
- 1. the study of living things
- 2. a medicine used to cure infections and bacteria
- 3. the removal of living tissue
- 5. the same as biography except written by yourself
- 6. a person who studies living things
- 7. the study of the nervous system