Across
- 2. The number of births in a given period of time
- 3. The number of deaths in a given period of time
- 4. All the living and non-living components of an area
- 12. A group of the same species that interbreed
- 15. The range of the population
- 17. The number of individuals in a population
- 19. Studies the natural world and how humans affect it.
- 20. Groups of ecosystems with a similar climate
Down
- 1. The length of time an individual is expected to live
- 5. The spacial distribution of individuals within the population
- 6. All various populations in an area that interact make a
- 7. The parts of the Earth where life exists.
- 8. Non-living
- 9. The amount by which a populations size changes over time
- 10. Living
- 11. All similar organisms that can interbreed and produce viable offspring
- 13. When both species benefit
- 14. One organism benefits and there is no harm to the other organism
- 16. The study of the interactions of many organisms and their environment
- 18. One organism is helped, the other is harmed