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Across 6. Zone of air, land, and water at the surface of the Earth in which living organisms are found 9. biotic factor, such as disease or competition, that affects population size in a direct relationship to the population’s density (2 Words) 14. place where an organism lives and is able to survive and reproduce 16. study of the interactions of organisms with other organisms and with the physical and chemical environment 17. repeated production of offspring at intervals throughout the life cycle of an organism 18. growth, particularly of a population, in which the increase occurs in the same manner as compound interest (2 Words)

Down 1. abiotic factor, such as fire or flood, that affects population size independent of the population’s density (2 Words) 2. due to industrialization, a decline in the birth rate following a reduction in the death rate so that the population growth rate is lowered (2 Words) 3. results when member of a species attempt to use a resource that is in limited supply 4. maximum population growth rate under ideal conditions (2 Words) 5. n demographics, a display of the age groups of a population (3 Words) 7. properties of the rate of growth and the age structure of populations 8. number of years it takes for a population to double in size (2 Words) 10. largest number of organisms of a particular species that can be maintained indefinitely by a given environment (2 Words) 11. biological community together with the associated abiotic environment 12. favorable life-history strategy under stable environmental conditions characterized by the production of a few offspring with much attention given to offspring survival 13. assemblage of species interacting with one another within the same environment 15. group of individuals having a statistical factor in common, such as year of birth, in a population study