1. Scientists that Influenced Darwin’s Thinking

2. Learning Objectives
State how Hutton and Lyell described geological change
Describe how Lamark thought species evolved
Describe Malthus’ theory of population growth

3. An Ancient, Changing Earth
Two scientists who helped Darwin recognize how old the Earth is...
James Hutton
Charles Lyell

4. James Hutton
Geological forces like rain, wind, heat and cold temperatures, have shaped the Earth

5. James Hutton
Layers of rock form very slowly and rocks are moved up by forces beneath the Earth’s surface.

6. James Hutton
Estimated the Earth to be millions of years old.

7. Charles Lyell
Geological processes occurring now have shaped the Earth’s geological features over long periods of time.

8. Jean Baptiste Lamarck
By selective use or disuse of organs, organisms acquired or lost certain traits during their lifetime.

9. Jean Baptiste Lamarck
Selective use or disuse of an organ led to a change in that organ, that was then passed on to offspring.

10. Thomas Malthus
If the human population continued to grow unchecked, eventually there would be insufficient food and living space for everyone.

11. What factors determine which organisms survive and reproduce and which do not?

12. YouTube
Lamark’s Theory of Evolution

13. Stop Here

14. Thomas Malthus
Maple trees can produce thousands of seeds. Darwin wondered why the continents are not covered with maple trees?