Across
- 1. ecosystem where water covers the soil or near the surface for a leasr park the year
- 5. interation that one animal captures another animal and feeds off it
- 7. talls trees that form a covering
- 9. a material formed from decaying leaves and other matter
- 11. any necessity of life
- 14. is day to day condition of the earth's atmosphere
- 16. the ability to survive and reproduce
- 17. one organism lives inside or on another organism and harms it
- 20. succession a predictable changes that occurin a comminity over time
- 21. boreal forest
Down
- 2. plant that shreads its leaves at a particular season
- 3. zone sunlight near the surface in which photosynthesis
- 4. zone below photic zone where photosynthesis cannot occur
- 6. living together
- 8. a special kind of wetland, formed where a river meets the sea
- 10. organisms that live on or in sediments on the bottom of lakes, streams and oceans
- 12. one animal feeds on producers like plants
- 13. layers of permanently frozen topsoil
- 15. one organism benefits and the other is neither helped nor harmed
- 18. the general place where an organism lives
- 19. conditions over a period of time