1. HISTORY OF EVOLUTIONARY THOUGHT

2. Unit Objective #1 I CAN COMMUNICATE SCIENTIFIC INFORMATION THAT COMMON ANCESTRY AND BIOLOGICAL EVOLUTION ARE SUPPORTED BY MULTIPLE LINES OF EMPIRICAL EVIDENCE.

3. LIFE CHANGES OVER TIME  Earth formed 4.6 bya  Life began 3.5 bya  Most life as we know it has been here a relatively short amount of time on the geologic scale (~600 million years)

4.  What is a fossil:  Preserved remains or traces of an organism from the past  How to make a fossil:  Organism lives  Organism dies  Immediately, remains are buried to prevent rapid decomposition  Slowly remains (usually hard parts) are replaced w/ another material FOSSILS: OUR CLUES TO LIFE’S HISTORY

5.  http://www.youtube.com/watch?v=ClJ5lwl_wM0 http://www.youtube.com/watch?v=ClJ5lwl_wM0 FOSSIL ROCK ANTHEM

6.  Layers of the Earth show a consistently aging planet  Organisms living during the past have been preserved  Nearly all fossilized species are extinct  Therefore: life evolves as the environment changes BIG PICTURE

7.  Scientists have questioned how life came to be since BC  Scientists have formed theories for evolution for centuries  The widely accepted theory of evolution by natural selection explains… BIG PICTURE

8. PAST: ORGANISMS HAVE GONE EXTINCT

9. PRESENT: DIVERSITY OF LIFE ON EARTH

10. FUTURE: SPECIES CONTINUE TO EVOLVE