1. Early Ideas About Evolution
What ideas did Darwin use to develop his theory of evolution?

2. What is evolution?
Process of biological change where descendants look different than their ancestors
Darwin considered the “father of evolution”
Theories existed 100’s of years before Darwin

3. Early Scientists
Linnaeus – developed a classification system and observed that some organisms are hybrids
Buffon – proposed that species share ancestors
Erasmus Darwin – proposed more complex forms arose from less complex forms

4. Early Scientists
Lamarck – proposed that changes in an environment caused resulting physical changes – inheritance of acquired traits (NOT ACCEPTED TODAY)
Example – giraffe neck

5. Theories of Geologic Change
Age of the Earth
Fossils in lower layers of Earth are older than fossils higher up
Changes in Earth’s landforms take place over a long period of time

6. Evidence of Evolution Anatomy
Homologous Structures – features similar in structure but in different organisms with different functions

7. Evidence of Evolution Anatomy
Analogous Structures – structures that perform a similar function but have different structures

8. Evidence of Evolution Anatomy
Vestigial Structures – remnants of organs or structures that had a function in ancestors

9. Evidence of Evolution
Fossil sequences show changes in organisms over time
Geography – correlation between mainland species and island species

10. Evidence of Evolution Embryology – similarities between young in early
stages of life