Ecology crossword

3. a process that produces fresh drinking water by separating the water from the salts in salty water
6. suitable for drinking
8. non-living factors
9. the arrows in a food chain represent
10. all organisms in an area
13. a substance that harms living organisms when released into the environment
14. provides energy for a food chain
15. an organism that lives on or in a host organism and takes food from it while it is alive

1. when organisms need the same resources and struggle against eachother
2. metal square used for sampling
4. sampling along a line
5. where an organism lives
7. Where a different crop is planted in the same field each year in a 3- or 4-year cycle, such as potatoes, oats, beans and cabbages
11. all organisms of the same species
12. living factors