The document is a science textbook chapter about changing environments. It contains passages about how droughts, fires, and overgrazing by elephants can impact habitats. It also discusses how homes and farms can affect the environment and pollution. The chapter addresses different types of organisms that can become endangered and ways conservation efforts can help, including zoos breeding endangered species for release into the wild. It poses questions about these topics and natural changes that alter habitats.

1. Science Chapter 4: Changing Environments Let's Begin!

2. Which event is most likely to change a forest habitat? A. The wind pollinates pine cones B. Berries ripen in the bushes C. Baby blue jays learn to fly D. There is no rain for three months

3. Answer D. There is no rain for three months

4. How might a drought change the environment? A. the ground may not hold all of the rain B. plants may grow too quickly for the animals to eat them C. lakes and rivers might dry up D. beaver dams might get washed away in the flood

5. Answer C. lakes and rivers might dry up

6. What might happen if elephants eat all of the plants in an area? A. Other animals who eat those plants will leave in search of food B. The elephants will move on to another area C. After a while, grasses and small plants begin growing there D. All of the above

7. Answer A. Other animals who eat those plants will leave in search of food B. The elephants will move on to another area C. After a while, grasses and small plants begin growing there D. All of the above

8. Why might a seedling that sprouts after a forest fire be more likely to grow into a tree than one that sprouted before the fire? A. The fire kills many plants B. Before the fire, the tall trees blocked the sunlight the sprouts needed to grow C. Before the fire, there were no seeds on the ground D. After the fire there are no seeds

9. Answer B. Before the fire, the tall trees blocked the sunlight the sprouts needed to grow

10. What kind of organisms can become endangered? A. only plants B. only animals C. only predators D. any kind of organism

11. Answer D. any kind of organism

12. All of the following organisms are extinct EXCEPT A. the giant panda B. the passenger pigeon C. the wooly mammoth D. the dinosaurs

13. Answer A. the giant panda

14. Which of these is NOT a fossil? A. a dinosaur bone that has been turned to stone B. the impression of an ancient giant fern in a rock C. the feather of a passenger pigeon D. an ancient cockroach, pressed in mud, turned into stone

15. Answer C. the feather of a passenger pigeon

16. Which food comes from plants? A. spaghetti noodles B. rice C. tortillas D. all of the above

17. Answer A. spaghetti noodles B. rice C. tortillas D. all of the above

18. True or False: If homes are built far from farms, they will NOT affect the environment.

19. False... but why?

20. True or False: Litter makes top soil and mud.

21. False...but why is that?

22. True or False: People can help save plants and animals by recycling and planting trees.

23. True! Do you recycle or plant trees?

24. True or False: Wool sweaters come from animals.

25. True! Which animal?

26. True or False: A drought is a long period of heavy rain.

27. False! What is a drought?

28. True or False: Animals can change their habitats.

29. True! How can they change it?

30. True or False: Endangered animals can become extinct if they all die.

31. True!

32. True or False: Farmers do not change the land in order to grow food.

33. False! How do they change the land?

34. True or False: Pollution is anything harmful added to the air, water, or land.

35. True!

36. True or False: Some zoos raise babies of endangered species and then release them into the wild habitat.

37. True! Scientists study animals in the zoos.

38. Ways that organisms can become endangered:

39. Ways that organisms can become endangered: Natural changes in climate or environment may make survival very difficult for some organisms

40. People often endanger organisms by destroying their habitats, by hunting too many of them, or polluting their environment

41. Suppose that some kind of insect destroys over half of the world's cotton crop in one year. Predict some of the effects of this loss.

42. Suppose that some kind of insect destroys over half of the world's cotton crop in one year. Predict some of the effects of this loss. Cotton will become scarce