Across
- 4. variety of species of animal and plant in an ecosystem
- 6. artificial suply of water
- 7. type of ecosystem where outputs are balanced by gains
- 8. found on the end of bones
- 10. energy going into a n ecosystem
- 12. type of engineering involving replacement body parts
- 13. when land becomes infertile
- 15. occurs when body temperature rises
- 17. increased nitrate levels in rivers and lakes can lead to this
- 20. waste produced in an ecosystem
- 21. cells the of technology used to treat illnesses
Down
- 1. used to give plants extra nutrients
- 2. joins artery and veins together
- 3. feed on dead organic material
- 4. build up of waste in a food chain
- 5. cannot be used up
- 9. working together in pairs
- 11. amount of natural resources which can be used so that numbers are conserved
- 14. prevents soil erosion
- 16. bacteria which break down dead material
- 18. joins muscles to bones
- 19. prevent extremes of temperatures