Population Ecology

3. part of an ecosystem that has never been living
4. all the populations in a particular area
5. graph that shows how the likelihood of death varies with age
8. anything an organism needs
9. the number of individuals within a population per unit area
10. the proportion of males to females in a population
11. the specific environment in which an organism lives
14. a seasonal movement into and out of an area
20. occurs when a population increases by a fixed percentage each year
21. the number of individual organisms present in a given population at a given time
22. all the living things and their physical environments within a particular area
23. characteristic of the environment that restricts population growth
25. how organisms are arranged within an area

1. a limiting factor whose influence changes with the population density
2. the relative numbers of organisms of each age within a population
6. the largest population size that an environment can sustainably support
7. the arrival of individuals from outside an area
12. the departure of individuals from a given area
13. the maximum ability to produce offspring in ideal conditions
15. a visual tool used to show the age structure of populations
16. a group of individuals that interbreed and produce fertile offspring
17. members of a species that live in the same area
18. the study of how organisms interact with each other and with their environments
19. part of an ecosystem that is living or used to be living
24. the arrival of individuals from outside a given area