1. 15.3 – Darwin Presents His Case

2. Darwin’s Publication
After Darwin’s journeys he wrote and published a book called On the Origin of Species
In this book he proposed his thoughts on how evolution happened called natural selection

3. Natural Variation vs Artificial Selection

4. Evolution by Natural Selection
Darwin proposed that as populations grew that there would be a struggle for existence
A key factor in the above would be survival of the fittest
Successful adaptions enable organisms to be better suited for environment
Those adaptations are then passed on to next generations
Those that are adapted best for their environment will have more offspring and those that are not will either die or have few offspring
A&feature=fvsr

5. Descent with Modification
Darwin proposed that over long periods of time organisms developed different structures to adapt to different environments
As a result species today look different from their ancestors
Common Descent
All species-living and extinct-were derived from same ancestors

8. The Fossil Record
Archaeopteryx

9. Lucy

10. Geographic Distribution of Living Species
Section 15-3
Beaver
Beaver
Muskrat
Beaver and Muskrat
Coypu
Capybara
Coypu and Capybara
NORTH AMERICA
Muskrat
Capybara
SOUTH AMERICA
Coypu

11. Homologous Body Structures
Section 15-3
Turtle
Alligator
Bird
Mammals
Typical primitive fish

12. Vestigial Organs

13. Similarities In Early Development

14. Concept Map Evidence of Evolution includes The fossil record
Geographic distribution of living species
Homologous body structures
Similarities in early development
which is composed of
which indicates
which implies
which implies
Physical remains of organisms
Common ancestral species
Similar genes