Across
- 4. an individual life form
- 5. a group of organisms of different species
- 7. particular group living in an area
- 8. one benefits, the other no benefit or harm
Down
- 1. living as a parasite in or on another organism
- 2. beneficial to both organisms involved
- 3. the surface, atmosphere, and hydrosphere
- 6. a community of organisms and their environment