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Across 2. nonliving part of the environment 6. all the populations in an area that live and interact with each other 7. forces are in balance 10. made up of a community of organisms and its abiotic environment 11. first organisms to live on bare rock (ex. lichen) 12. living part of the environment 13. group of parts joined together in a way where the group is greater than the sum of its parts 14. occurs when a new plant community begins to grow in existing soil after a change

Down 1. the orderly changes an ecosystem goes through as it develops or regrows 3. occurs when a community of living things starts to live in an area that has not previously supported life (ex. bare rock) 4. describes an ecosystem that does not change much 5. made up of anything that affects an organism 8. group of a species that live together in the same area at the same time 9. whole area of Earth where life exists