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Across 2. multiple individuals of a species in the same location at the same time 5. mating with relatives 6. the death rate of a population 8. the number of deaths in a period of time 9. how long on average an individual is expected to live 12. the spatial distribution of individuals within the populaltion 15. an expression of the increase in the size of an organism or population over a given period of time 16. a model of population growth that assumes that infinite resources levels limit population growth 17. the number of individuals the environment can support over a period of time 18. obtaining food by hunting animals and gathering roots, berries, etc 19. any factor that restrains the growth of a population 20. a factor whose impact on a population's growth does depend on population density

Down 1. a factor whose impact on a population's growth does not depend on population density 3. the movement of individuals into a population 4. the number of births occuring in a period of time 7. a graph showing the number of individuals surving at each age in a given species 10. measures how crowded a population is 11. distribution of individuals among different ages in a population 13. the movement of individuals out of the populaiton 14. a model of population in which a constant unlimited growth rate results in increase in population size