biology vocabulary

2. the gradual process of species becoming extinct.
3. the number of organisms per unit area.
7. when plants and other things get removed from ecosystems causing animals to go extinct.
8. any factor in the environment tat depends on the number of members in a population per unit area.
10. explains how fast a given population grows.
15. overuse of species with economic value.
16. an event in which a large percentage of all living species become extinct in a short period of time.
18. when one species plays such a large role in an ecosystem.
20. the maximum number of individuals in a species that an environment can support for the long term.

1. the variety of life in an area that is determined by the number of different species in that area.
4. any factor in the environment that doesn't depend on the number of members in a population per unit area.
5. the number of different species and the relative abundance of each species in a biological community.
6. the pattern of spacing of a population within an area.
9. all materials and organisms found in the biosphere.
11. the variety of ecosystems present in the biosphere.
12. entire species permanently disappear from the biosphere when the last member of the species dies.
13. the separation of an ecosystem into small pieces of land.
14. the variety of genes or inheritable characteristics that are present in a population.
17. the term ecologists use to describe the number of individuals moving away from a population.
19. the term ecologists use to describe the number of individuals moving into a population.