Evidence for Evolution

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Presentation transcript:

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

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

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

Fossil Formation

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. Copyright © McGraw-Hill Education Fossil Evidence of Change

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

Trace Fossil

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

Molds and Casts

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

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

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

Amber

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

Original Material

26,000 years ago

Mammoth Site Skull Excavation

Fossil Record Mystery

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: http://www.earth4567.com/talks/life.html © 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.