1. Unit 9 Lesson 1 How Do Environmental Changes Affect Organisms? Copyright © Houghton Mifflin Harcourt Publishing Company

2. Unit 9 Lesson 1 How Do Environmental Changes Affect Organisms? Florida Benchmark Copyright © Houghton Mifflin Harcourt Publishing Company SC.5.L.15.1 Describe how, when the environment changes, differences between individuals allow some plants and animals to survive and reproduce while others die or move to new locations.

3. Unit 9 Lesson 1 How Do Environmental Changes Affect Organisms? It’s All Around You Copyright © Houghton Mifflin Harcourt Publishing Company The environment is all of the living and nonliving things in nature. The environment provides you with food, air, water, and a safe place to live. All parts of the environment are connected and interact with each other.

4. Unit 9 Lesson 1 How Do Environmental Changes Affect Organisms? It’s All Around You Copyright © Houghton Mifflin Harcourt Publishing Company Living things that interact with each other form a community. A community of living things and the nonliving things around them are called an ecosystem.

5. Unit 9 Lesson 1 How Do Environmental Changes Affect Organisms? Change Comes Naturally Copyright © Houghton Mifflin Harcourt Publishing Company Natural events, such as floods, earthquakes, forest fires, and droughts, can change the environment quickly. Events such as an ice age can change the environment more slowly. Volcanic eruptions can cause changes quickly or over long periods of time.

6. Unit 9 Lesson 1 How Do Environmental Changes Affect Organisms? Change Comes Naturally Copyright © Houghton Mifflin Harcourt Publishing Company What kinds of changes to the environment may have happened during the last ice age?

7. Unit 9 Lesson 1 How Do Environmental Changes Affect Organisms? Animal Architects Copyright © Houghton Mifflin Harcourt Publishing Company Animals can cause changes to the environment. Changes made by animals can cause damage to some parts of the environment. Changes made by animals can cause positive changes to other parts of the environment.

8. Unit 9 Lesson 1 How Do Environmental Changes Affect Organisms? Humans Change the Environment Copyright © Houghton Mifflin Harcourt Publishing Company Human activities can harm an ecosystem. Open-pit mining and cutting down forests are examples of human activities that can cause habitat destruction. A habitat is the place where an organism usually lives.

9. Unit 9 Lesson 1 How Do Environmental Changes Affect Organisms? Humans Change the Environment Copyright © Houghton Mifflin Harcourt Publishing Company Pollution from waste can kill organisms and cause disease. Pollution is any harmful substance that gets into the environment.

10. Unit 9 Lesson 1 How Do Environmental Changes Affect Organisms? Humans Change the Environment Copyright © Houghton Mifflin Harcourt Publishing Company Not all changes caused by humans are harmful. Conservation is the act of protecting ecosystems and organisms. Humans practice conservation by restoring habitats, removing invasive plants and animals, and caring for injured animals.

11. Unit 9 Lesson 1 How Do Environmental Changes Affect Organisms? Living Things Change Copyright © Houghton Mifflin Harcourt Publishing Company Differences among organisms can allow some organisms to survive better than others. Sometimes living things change because their environment changes. In large populations, there are usually a few organisms that survive and multiply.

12. Unit 9 Lesson 1 How Do Environmental Changes Affect Organisms? Gone! Copyright © Houghton Mifflin Harcourt Publishing Company Some organisms do not survive changes in the environment. Extinction happens when all the members of a certain kind of living thing die.

13. Unit 9 Lesson 1 How Do Environmental Changes Affect Organisms? Gone! Copyright © Houghton Mifflin Harcourt Publishing Company Giant reptiles like the Tyrannosaurus rex could not survive a cooler environment and became extinct. The Tasmanian wolf is extinct because of too much hunting.

14. Unit 9 Lesson 1 How Do Environmental Changes Affect Organisms? Gone! Copyright © Houghton Mifflin Harcourt Publishing Company Could the extinction of the dodo bird have been prevented? Why or why not?