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5. 100 200 300 400 500 A- Balanced Ecosystems B- Vocab C- Natural Disasters D- Hosts and ‘sites E- Teacher’s Choice

6. Why do prairie dogs survive in the Great Plains? A- They have driven out all the other prairie dogs. B- Their needs are met by that environment. C- Humans feed them. D- Humans have moved to the prairie. A 100

7. Why do prairie dogs survive in the Great Plains? B- Their needs are met by that environment.

8. What describes a balanced ecosystem? A- There is enough water for people. B- One type of animal and plant depend on each other. C- No animal or plant drives out other animals or plants. A 200

9. What describes a balanced ecosystem? C- No animal or plant drives out other animals or plants.

10. A meadow forest has too many squirrels. What would help balance this ecosystem? A- more rain that grass needs B- more owls that eat squirrels C- fewer owls that eat squirrels D- more acorns for squirrels to eat A 300

11. A meadow forest has too many squirrels. What would help balance this ecosystem? B- more owls that eat squirrels

12. How do these organisms’ interactions help balance their ecosystem? A- Ants make homes in grass. B- Grass and ants both need oxygen. C- Grass makes oxygen, and animals use it. A 400

13. How do these organisms’ interactions help balance their ecosystem? C- Grass makes oxygen, and animals use it.

14. How might a forest fire affect the balance of a forest ecosystem? A- It destroys sources of food and shelter for living things. B- It creates sources of food. A 500

15. How might a forest fire affect the balance of a forest ecosystem? A- It destroys sources of food and shelter for living things.

16. What happens when two or more species in an ecosystem must use the same limited resource? A- succession B- parasites C- competition D- extinction B 100

17. What happens when two or more species in an ecosystem must use the same limited resource? C- competition

18. What are organisms that live on or in another organism, helping themselves but hurting the other organism? A- host B- parasite C- endangered D- producer B 200

19. What are organisms that live on or in another organism, helping themselves but hurting the other organism? B- parasite

20. What is a gradual change from one community of organisms to another? A – natural disaster B- hazardous waste C- competition D- succession B 300

21. What is a gradual change from one community of organisms to another? D- succession

22. What are substances that are very harmful to humans and other organisms? A- hazardous wastes B- hosts C- parasites D- natural disasters B 400

23. What are substances that are very harmful to humans and other organisms? A- hazardous wastes

24. What is an organism that is harmed by a parasite? A- endangered species B- extinct species C- host D- parasite B 500

25. What is an organism that is harmed by a parasite? C- host

26. How would an ecosystem change if the fish that were a main source of prey for sharks became sick and died? A: The number of sharks would decrease. B: The number of sharks would increase. C- The sharks would find new prey. C 100

27. How would an ecosystem change if the fish that were a main source of prey for sharks became sick and died? A: The number of sharks would decrease.

28. Which would cause an ecosystem to change quickly? A- a gradual climate change B- a lake becoming a marsh C- a lake drying up D- an earthquake C 200

29. Which would cause an ecosystem to change quickly? D- an earthquake

30. C 300 What could scientists tell from a fish fossil in a prairie? A- The fish is extinct. B- Fish one had legs to travel. C- Fish once lived on the prairie. D- The prairie was once a sea or lake.

31. C 300 What could scientists tell from a fish fossil in a prairie? D- The prairie was once a sea or lake.

32. DAILY DOUBLE C 400 DAILY DOUBLE

33. What is one way a flood might affect an ecosystem? A- the grass will become dry B- the grass may die C- the grass will grow C 400

34. What is one way a flood might affect an ecosystem? B- the grass may die

35. C 500 If there was a flood, which population might increase? A- squirrels B- prairie dogs C- chipmunks D- fish

36. C 500 If there was a flood, which population might increase? D- fish

37. What impact does a parasite have in an ecosystem?? A- helps the entire ecosystem B- hurts one organism and helps another C- helps both the host organism and the parasite D- hurts the host and the parasite D 100

38. What impact does a parasite have in an ecosystem?? B- hurts one organism and helps another

39. D 200 A _________ is an organism that is harmed by a parasite. A- competition B- host C- endangered species D- competition

40. D 200 A _________ is an organism that is harmed by a parasite. B- host

41. If a host dies, the parasite… A- continues to thrive. B- might look for another host. C- competes with other hosts. D 300

42. If a host dies, the parasite… B- might look for another host.

43. Which organism benefits from the parasite-host relationship? A- both B- neither C- parasite D- host D 400

44. Which organism benefits from the parasite-host relationship? C- parasite

45. What could help an organism that is living with the parasite? A- Removal of the parasite. B- Nothing can help it. C- Adding more parasites. D- Finding a new host. D 500

46. What could help an organism that is living with the parasite? A- Removal of the parasite.

47. What does this illustration show? A- parasites and hosts B- competition C- succession E 100

48. What does this illustration show? C- succession

49. What might be a reason an animal becomes extinct? A- Its habitat has been destroyed. B- It is a predator. C- It produces oxygen. D- It adapted to its environment. E 200

50. What might be a reason an animal becomes extinct? A- Its habitat has been destroyed.

51. How can damage from strip mines be repaired? A- Erosion can fill the hole. B- Mining companies can replace the soil. C- Rain can wash the rocks away into rivers. E 300

52. How can damage from strip mines be repaired? B- Mining companies can replace the soil.

53. Why did the United States establish national parks? A- to make money for the national government B- to give Americans a chance to see things they’ve never seen before C- to preserve nature’s beauty and habitats of plants and animals E 400

54. Why did the United States establish national parks? C- to preserve nature’s beauty and habitats of plants and animals

55. When does succession occur? A- All the time B- When an environment changes C- When competition occurs D- When there is a parasite E 500

56. When does succession occur? B- When an environment changes