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Across 1. a group of organisms that can interbreed and produce fertile offspring 4. all the organisms living together in a place, along with the nonliving components of their environment 7. a group of ecosystems that have similar climates and typical organisms 8. any living parts of the environment with which an organism may interact 10. all of the feeding relationships in an ecosystem 15. the range of physical and biological conditions in which a species lives and the way it obtains what it needs to survive and reproduce 18. a group of individuals that belong to the same species and live in the same area 19. limiting factors affect all populations similarly, regardless of size 20. consumers 21. occurs when one species benefits and the other is harmed 22. consists of all life on Earth and all parts of the Earth where life exists (land, water, atmosphere) 23. the study of interactions between organisms and their environment 24. occurs when both species benefit from the relationship 25. an organism’s ability to withstand fluctuations in the environment

Down 2. which succession is the natural changes that occur in an ecosystem over time 3. different populations that live together in a defined area 5. a relationship in which two different species live closely together 6. are nonliving parts of the environment 9. a series of steps in which organisms transfer energy by eating and being eaten 11. limiting factors affect the population more as it grows in size 12. which succession is the colonization of barren land by communities of organisms 13. the amount of energy or matter that contained in each trophic level of a food chain 14. which succession is the series of changes that occur after existing community is disrupted 16. occurs one species benefits and the other is neither harmed nor benefited 17. primary producers