Across
- 1. large group of ecosystems
- 3. the population per unit area
- 11. the pattern of spacing a population in an area
- 14. succession that results when one community replaces another
- 15. the role or position that an organism has in its environment
- 16. a group of populations that occupy the same area at the same time
- 17. factor that restricts the numbers, reproduction, or distribution of organisms
- 18. the rate at which a population grows
- 22. the maximum number of individuals in a species that an environment can support
- 23. living factors in an environment
- 24. the number of individuals moving into a population
- 25. the disappearance of a species when the last of its members dies
- 26. substance that organisms obtain from the environment to sustain life
Down
- 2. anything that takes up space and has mass
- 4. the number of individuals moving away from a population
- 5. the cycling of matter through the biosphere
- 6. the number of different species living in an area
- 7. when two or more species live together
- 8. the study of the relationships between organisms and the interaction of the organisms and their environment.
- 9. a community and all of the abiotic factors that affect it
- 10. the total mass of living matter at each level
- 12. process in which fixed compounds are converted back into nitrogen gas
- 13. the portion of the Earth that supports life.
- 19. an area where an organism lives
- 20. nonliving factors in an environment
- 21. organisms of the same species that share the same location at the same time