2. Start

3. 1 2 1 4 3 2 1 4 3 2 1 4 3 2 4 3 1 2 3 4 Lesson 4 Vocab Lesson 1 Lesson 2 Lesson 3

4. 1 What is one way people can disturb the balance of an ecosystem? a. Dumping waste in rivers b. Taking a walk c. Planting flowers What is ….a Click here for answer back

5. 2 What can mining companies do to repair the damage from a strip mine? a.Mining companies can go mine elsewhere b.Mining companies can replace the soil and replant trees and grasses c.Mining companies can hope it rains to wash the rock away back Click here for answer What is ….b

6. 3 The U.S. created national parks a.to make money for each state. b.to give people places to visit. c.to preserve and protect the environment of plants and animals. back Click here for answer What is ….c

7. 4 Hazardous wastes are a.Substances that can hurt humans and other organisms. b.Substances that can be poisonous or cause diseases c.Both a & b back Click here for answer What is ….c

8. 1 When two or more species must use the same limited resource a. Parasite b. succession c. competition back Click here for answer What is ….c

9. 2 Organisms that live on or in another organism a. Host b. Parasite c. competition back Click here for answer What is ….b

10. 3 Organism that is harmed by the parasite a.Succession b. Hazardous waste c. host back Click here for answer What is ….c

11. 4 Gradual change from one community of organisms to another a. Succession b. Host c. competition back Click here for answer What is ….a

12. 1 Why do polar bears in Alaska survive? a.They have driven out all the other bears. b.Humans feed them, which helps them survive. c.Their needs are met in that environment. back Click here for answer What is ….c

13. 2 Which describes a balanced ecosystem? a.The food supply, shelter, and living space for animals and plants is just right. b.Humans create shelter and food for animals and plants. c.There is enough food for animals to exist. back Click here for answer What is ….a

14. 3 Think of a squirrel and trees-how do these two organisms interact and help balance their ecosystem? a.Squirrels make homes in grass. b.Trees and squirrels both need oxygen. c.Trees make oxygen, and squirrels use it. back Click here for answer What is ….c

15. 4 What plant and animal needs are met by an ecosystem? a.Food water air b.Food, water, living space, shelter, light, air, soil, and weather conditions c.Weather conditions, soil, food, water, air back Click here for answer What is …b.

16. 1 A field has too many mice. What would help balance this ecosystem? a.more cats that eat mice b.More cheese for mice to eat c.Fewer cats that eat mice back Click here for answer What is ….a

17. 2 How would an ecosystem change if the mice that were the main prey for cats became sick and died? a.The cats would find new prey. b.The number of cats would decrease. c.The mice and cats would compete for food. back Click here for answer What is ….b

18. 3 What impact does a parasite have in an ecosystem? a.Hurts both the host organism and parasite b.Hurts one organism and helps another c.Helps the entire ecosystem back Click here for answer What is ….b

19. 4 When the ants eat the wax off the bud of a peony, this is an example of a.Succession b.Living in harmony c.competition back Click here for answer What is ….b

20. 1 Which would cause an ecosystem to change quickly? a.Hurricane b.Pond drying up c.a weather change back Click here for answer What is ….a

21. 2 What might be the effect on an ecosystem of a climate change from cold to hot? a.A change for a bear and a squirrel b.No change c.A change in kinds of plants and animals back Click here for answer What is ….c

22. 3 What could scientists tell from a whale fossil found in the mountains? a.That whales are now extinct. b.Whales once had legs to climb a mountain. c.At one time in history, the mountains were a body of water. back Click here for answer What is ….c

23. 4 How are a owl and an eagle able to succeed, even though they compete for food? a.The eagle eats the owl. b.One hunts at night, and the other hunts during the daytime. c.The owl changes its diet. back Click here for answer What is ….b