Across
- 4. the struggle between organisms to survive as they attempt to use the same limited resources in the same place at the same time
- 5. all the members of one species living in the same area
- 8. a diagram that shows the amount of energy that moves from one feeding level to another in a food web
- 12. the community of organism that live in a particular area, along with their nonliving environment
- 14. a type of symbiosis between two species in which one species benefits and the other species is neither helped nor harmed
- 17. an environmental factor that causes a population to decrease in size
- 18. a type of symbiosis in which both species benefit from living together
- 19. how an organism makes its living and interacts with the biotic and abiotic factors in its habitat
- 21. all the different populations that live together in a certain area
Down
- 1. a living thing
- 2. a living or once living part of an organism's habitat
- 3. the pattern of overlapping feeding relationships or food chains among the various organisms in an ecosystem
- 6. an organism that can make its own food
- 7. any relationship in which two species live closely together and that benefits at least one of the species
- 9. an organism that gets energy by breaking down biotic wastes and dead organisms and returns raw materials to the soil and water
- 10. a type of symbiosis in which one organism lives with, on, or in a host and harms it
- 11. an interaction in which one organism kills another for food or nutrients
- 13. the community of organisms that live in a particular area, along with their nonliving environment
- 15. a nonliving part of an organism's habitat
- 16. an environment that provides the things a specific organism needs to live, grow, and reproduce
- 20. an organism that obtains energy by feeing on other organisms