Chapter 6 – Changes in Ecosystems

1. Chapter 6 – Changes in Ecosystems Lesson #1 – How do Ecosystems Change? Lesson #2 – How do Species Change? Lesson #3 – How do Changes Cause More Changes?

2. Lesson #1 - Questions • What can cause changes in environments? • What affect did zebra muscles and garlic mustard plants have on native species? • What type of rain is harmful to the environment? • What environmental affect would recycling help?

3. Animals Change Ecosystems • Organisms can cause changes in ecosystems. • Some changes can help or harm the environment. • Beaver dams change the environment.

4. New Species in Environment/People Changing Environment • People make physical changes to ecosystems. • People change ecosystems both accidentally and on purpose.

5. Garbage and Pollution • Garbage is placed in landfills and pollutes the ground. • Pollution causes acid rain that can hurt plants and animals.

6. Ecosystems can be changed by humans as well as forces of nature. • True • False

7. When people introduce new animals or plants into an ecosystem it changes. • True • False

8. The garbage in landfills decays quickly. • True • False

9. Acid rain is caused by water pollution. • True • False

10. Lesson #2 - Questions • Describe heredity. • Is the color of a flamingo’s feathers an inherited trait, or acquired? • Name two different adaptations. • Why would there be more competition among organisms if an ecosystem changes?

11. Inheriting DNA • Hereditary is the process by which offspring receive half of their genes from each parent. • Because offspring inherit traits from both parents, they differ from both parents.

12. Traits That Are Not Inherited • Not all traits are a result of DNA • Flamingos are born white and turn pink with eating shrimp and other foods • Soil also affects plant appearance

13. Adaptations • An adaptation is a trait that allows an organism to better fit into an ecosystem. • Structural adaptations are changes in body parts that help animals survive.

14. Behavioral Adaptations • Are inherited adaptations that help animals survive. • They affect how animals behave around other animals.

15. Every animal inherits the same amount of genes from each parent. • True • False

16. The environment does not affect a species appearance. • True • False

17. A hummingbirds long beak is a structural adaptation. • True • False

18. Adaptations to an environment can help a species live longer. • True • False

19. Lesson #3 - Questions • What adaptation allows hawks to live in cities? • Name a reason that humans might want to limit antibiotics and pesticides? • What happens to a species when it becomes extinct? • What might you look for to see if a species used to live on Earth?

20. How do changes cause more changes? • Some organisms change their behavior in response to a change, such as the kinds or numbers of other organisms in their ecosystems. • Pesticides are poisons that kill insects.

21. How do changes cause more changes? • When changes occur in an ecosystem, some organisms migrate to a place where conditions are more favorable. • Species that can’t move or adapt to the changes may become extinct.

22. Organisms adapt to harmful changes in their ecosystems. • True • False

23. Once organisms lose their habitats, they can never find new homes. • True • False

24. An extinct species has limited numbers of its kind. • True • False

25. Poisons in ecosystems can travel through the food chain. • True • False