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Across 3. The normally gradual change in species composition in a given area. (2 Words) 4. Capacity to withstand external stress and disturbance. 7. The ability of a living system such as a grassland or forest to survive moderate disturbances. 8. Ecological community in which populations of plants or animals remain stable and exist in balance with each other and their environment. (2 Words) 9. the process by which a plant or animal community successively gives way to another until a stable climax is reached. 10. Living organisms 11. Ecological succession in an area without soil or bottom sediment. (3 Words)

Down 1. Populations of all species living in an area at a particular time. 2. Ecological succession in an area in which natural vegetation has been removed or destroyed, but the soil or bottom sediment have not. (3 Words) 5. All external conditions, factors, matter, and energy, living and nonliving, that affect any living organism or other specified system. 6. The ability of of a living terrestrial system to be restored through secondary ecological succession after severe disturbance. 9. Group of similar organisms