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Across 2. single species that is not usually abundant in a community yet exerts strong control on the structure of a community 7. symbiotic relationship in which both species benefit from the relationship 8. number of individual per unit of area 9. interaction in which the organism (the predator) captures and feeds on another organism 14. succession that occurs in an area in which no trace of a previous community is present 15. ability of an organism to survive and reproduce under circumstances that differ from their optimal conditions 17. factor that causes population growth to decrease 18. type of succession that occurs in an area that was only partially destroyed by disturbances 19. symbiotic relationship in which one organism lives on or inside another organism and harms it 20. growth pattern in which the individuals in a population reproduce at a constant rate 21. limiting factor that depends on population density

Down 1. limiting factor that affects all populations in similar ways regardless of population density 3. largest number of individuals pf a particular species that a particular environment can support 4. area where and organism lives including the biotic and abiotic factors that affect it 5. relationship in which two species live close together 6. states that no two species can occupy the same niche in the same habitat at the same time 8. first species to populate an area during a succession 10. any necessity of life such as water, nutrients, light, food and space 11. symbiotic relationship in which one organism benefits and the other is neither helped or harmed 12. scientific study of human populations 13. series of gradual changes that occur in a community following a disturbance 16. full range of physical and biological conditions to which an organism lives and the way in which the organism uses those conditions