1. Evidence for Evolution
Fossil Record
Natural Selection/Adaptation
Homologous Structures/Vestigual structures
Embryology
DNA Sequences

2. Questions 1. How many animals made the tracks on the next picture?
2.What kind of animals were they?
3. WHAT HAPPENED ? ? ?

3. Can you tell what kinds of animals made these prints and what probably happened?

4. Fossil Formation

5. Clues in Rocks Fossil formation sedimentary rock.
sediments build; cover the organism’s remains.
Minerals replace the organic matter or fill the empty pore spaces of the organism
Organism decomposes and leaves behind an impression of its body.
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Fossil Evidence of Change

6. Classification of Fossil Types
Trace Fossil
-any indirect evidence left by an organism.

9. Trace Fossil

10. Classification of Fossil Types
Molds and Casts
-impression of an organism.

11. Molds and Casts

17. Classification of Fossil Types
Replacement
-A mold filled with sediment.

19. Classification of Fossil Types
Petrified
-empty pore spces are filled in by minerals.

20. Classification of Fossil Types
Amber
-preserved tree sap traps an entire organism.

21. Amber

23. Classification of Fossil Types
Original Material
-mummification or freezing preserves an entire organism.

24. Original Material

29. 26,000 years ago

33. Mammoth Site Skull Excavation

34. Fossil Record Mystery

35. Evidence: Fossil Record
en.wikipedia.org/wiki/Image:Eopraptor_sketch5.png
© World Health Org.
Presenter notes: All the pieces of evidence that we have discussed so far point to the inter-relatedness of all living things and their evolution from a single common ancestor. However, perhaps the most compelling piece of evidence in support of evolution is the fossil record itself. The fossil record shows a sequence from simple bacteria in the oldest rocks through to more complicated organisms like dinosaurs and humans in much younger rocks. It shows that different species arose at different times and, as we see in the next slide, in many cases there are clear transitions from one species, or group, to another.
Background note: A companion talk on the History of Life can be downloaded from the Your Planet Earth website:
© NASA
origins
bacteria
complex cells
dinosaurs
humans
The fossil record shows a sequence from simple bacteria to
more complicated organisms through time and provides the most
compelling evidence for evolution.