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Across 3. Representation of the age structure of a population to show the proportion in each age class; used by demographers to assess a population's potential for growth. 5. The number of individual organisms in a given area or volume. 6. The regrowth of a previously existing community after an ecological disturbance. 7. Direct or close relationship between individuals of different species that live together. 11. Organism that is killed and consumed by another organism. 12. Theoretical maximum population size that the environment can sustain over an extended period of time. 14. Competition for limited resources among members of different species. 21. A certain type of growth that results in a J-shaped curve with a brief lag phase followed by a steep increase in the growth curve on a graph. 23. A type of symbiotic relationship in which both partners benefit from the relationship. 25. Population increase that results in an S-shaped curve; growth is slow at first, steepens in an exponential pattern, and then levels off due to environmental resistance. 26. A life strategy designed to take advantage of stable environmental conditions. 27. Change in a population size per individual over a given time frame. 28. A life strategy designed to take advantage of favourable conditions.

Down 1. Competition between members of the same population for a limited resource. 2. Biotic factor that limits a habitat's carrying capacity. 4. Abiotic factor that limits a habitat's carrying capacity. 6. Sequence of invasion and replacement of species in an ecosystem over time. 8. Concept of living in a way that meets are needs without compromising the health of future generations or of the planet. 9. Highest possible per capita growth rate for a population, given unlimited resources and ideal living conditions. 10. Event that changes the structure of a community, sometimes destroying all actively growing organisms. 13. Adaptation that helps individuals avoid predation; includes camouflage, mimicry, and using body colours as warning signals. 15. The last or final stage of succession in an area; may remain relatively stable if there s no major environmental changes. 16. Prevents a population from growing at its biotic potential and determines the carrying capacity of the habitat. 17. The development of a new community in a previously barren area where there is no soil present. 18. First species to colonize a barren or disturbed habitat and initiate primary succession. 19. One organism benefits by living on or in an organism of a different species that is harmed by the association. 20. Change in a population size over a specific time frame. 22. One individual lives close to or on another and benefits, and the host neither benefits, nor is harmed. 24. Organism that kills and consumes other organisms.