Across
- 3. a natural resource that can be replenished.
- 6. species that are the first to colonize newly created environments.
- 8. the living together of two different organisms of different species in a close and long-term association.
- 10. estimates the biologically productive land and sea area.
- 13. factors resulting from activities of a living thing.
- 15. variety of life on Earth.
- 18. an organism that cannot make its own food by carbon fixation.
- 20. the movement of animals away from a specific area.
- 22. the impact of humanity's actions on the quality of aquatic and terrestrial environment.
- 23. the process by which the concentration of a substance, such as pesticide, increases in the tissues of organisms at successively higher levels in a food chain.
- 25. place where an organism makes its home.
- 26. conserved matter moves through the biotic and abiotic parts of an ecosystem.
- 30. describes a single environment and every living organism and non-living factor that is contained within it or characterizes it.
- 32. branch of biology that studies how organisms interact with the environment and other organisms.
- 34. an autotrophic organism that can produce complex organic compounds from simple inorganic molecules.
- 36. a natural resource that cannot be easily replaced by natural means at a pace quick enough to keep up with consumption.
- 37. species that have an extremely high impact on a particular ecosystem relative to its population.
- 38. an environmental factor that restricts growth, abundance, or distribution of a population in an ecosystem.
- 39. interactions between organisms of two different species.
Down
- 1. plants and animals first colonize a barren, lifeless habitat.
- 2. a graphical representation, showing the flow of energy at each trophic level in an ecosystem.
- 4. food chains in a single ecosystem.
- 5. prevailing weather conditions.
- 7. graphic representation of the number of individuals in a population that can be expected to survive to any specific age.
- 9. an animal establishing a home in a habitat because it has resources it can utilize or because the habitat is ideal for them.
- 11. a community of organisms adapted to a particular climatic or environmental condition on a large geographic area in which they occur.
- 12. an interacting group of various species in a common location.
- 14. a number of organisms that an ecosystem can sustainably support.
- 16. a level or a position in a food chain, food web, or an ecological pyramid.
- 17. the weight of living organisms of a species.
- 19. interrelationship of a species with all the biotic and abiotic factors affecting it.
- 21. non-living thing or condition that influences or affects an ecosystem and the organisms in it.
- 24. an organism that breaks down organic material such as the remains of dead organisms.
- 27. number of individuals per unit area.
- 28. a relationship between two species of organisms in which one species benefits while the other is unaffected.
- 29. a category that belongs within the food chain of an ecosystem.
- 31. in which plants and animals recolonize a habitat after a major ecological disturbance significantly alters an area but has not rendered it completely lifeless.
- 33. an organism that makes its own food from inorganic materials without needing other organisms.
- 35. a type of symbiotic relationship in which one organism benefits at the expense of another organism usually of different species.