Across
- 4. a graph showing the number
- 9. close living relationship between organisms from different species
- 11. measure of gauging human dependence on natural resources
- 13. consists of all the food chains in a single ecosystem.
- 15. introduction into the environment of a substance
- 17. non-living factors that impact an ecosystem
- 18. an organism that helps hold the system together of any ecosystem
- 21. environmental condition that limit the growth
- 23. a group of people living in the same place
- 25. resilient species that are the first to colonize barren environments
Down
- 1. organism that can produce their own food using energy from the environment
- 2. a resource that can be replenished naturally over time
- 3. an organism that cannot produce its own food
- 5. the movement of organism into a new habitat
- 6. the number of individuals per unit area or volume
- 7. The action of coming to live permanently in a foreign country
- 8. cycle one of several natural cycles
- 10. The weight or total quantity of living organisms of one animal or
- 12. the height is always the same.
- 14. environment of an animal, plant, or other organism
- 16. a relationship between two organisms in which one organism benefits, and one is unaffected.
- 19. a group of organisms that have a similar feeding mode
- 20. the study of the environment
- 22. interactions between organisms of two different species
- 24. long-term ,predictable atmospheric conditions of a specific area