Endangered Habitats

3. an animal that eats both plant and animal material
4. part of a river valley covered by water during floods
7. brought in from a foreign country
8. a decline in the quality of land, thereby making it less able to support agriculture or native vegetation
11. the area above the tree line in the mountains
13. in danger of extinction
17. when a plant or animal species dies out
18. changes to an animal or plant that develop over a long period of time to allow them to survive in a particular environment

1. the death of coral polyps resulting in the coral to turn white, caused by changes in the coral's environment such as an increase in sea temperatures or pollution
2. describes a plant or domestic animal that is living uncontrolled in the wild
5. to spend the winter in a sleep-like condition
6. preserved remains of a plant or animal from a bygone area
9. areas of land set aside by the government where public recreation needs and conservation issues are managed
10. a system formed by the interactions of living organisms and physical elements of environments
12. an area where the subsoil remains frozen throughout the year
14. area of sediment deposited at the mouth of a river
15. the growth of algae increases as a result of increased nutrient levels in the water
16. the natural home of an animal or plant, the place where it's normally found
19. hunting or removing animals or fish illegally