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Across 3. Caused by living organisms 8. Doesn't live long but reproduces a lot 12. An ecosystem covering a broad area which has distinctive climatic and soil conditions 14. The connection between predator and prey populations 17. Something that live in or on something else and causes harm 18. Movement of a specieas from one ecosystem to another 20. Non living components of the environment

Down 1. A factor whose effect on a population is the same whatever the population (usually Abiotic) 2. Factors that slow down the growth rate of species 4. Competition between different species 5. Competition between members of the same species 6. Factors whose effects on a population are relatively greater at higher population densities than at lowere population densities 7. The part of the earth where life can exist 9. All of the different populations of organisms that live together 10. All the members of a single species living in a particular area at the same time 11. The maximum number of organisms an area can support sustainably 13. A particular type of organism, where two individuals interbreed to produce offspring 15. Lives long and isn't predated 16. The particular place where a community of organisms is found 19. A description of the precise way in which an organism fits into its environment.