Ecology

6. Where organisms living in the same place recquire same resources
12. Graph showing number of individuals surviving against different age categories
13. Atmospheric moisture
15. Inherited feature that enables members of a species to live and reproduce in a habitat
18. Line across a community along which sampling occurs at regular intervals
19. Changes in the composition of a community which occur in response to an environmental gradient
20. Area of land subject to particular restrictions

1. Organisms interacting with their physical environment
2. Death rate
3. A group of organisms from the same species of different ages
4. Contamination of the natural environment
5. Between different species
7. The ability of a species to cope in environmental conditions
8. Capable of being prolonged
9. How a population is spread out
10. Occurs when one organism lives in or on another organism feeding off it but not killing it
11. Organisms such as fungi and bacteria which break down dead organisms
14. Average number of individuals belonging to a population that are present per unit area
16. Birth rate
17. To save from damage or destruction