1. -T-rex if haven’t already
Daily Warm-up March 3rd
What do paleontologists do? In layers of sediment, where are the oldest fossils found?
HW:
-Read 19.1
Turn in:
-T-rex if haven’t already

2. What can you observe?

3. Dating Fossils Relative Dating- using layers of sediment
Radiometric Dating- using radioactive isotopes
Half-life: how long it takes for half of the isotope to decay

4. Geologic Time Scale

5. Plate Tectonics
Change conditions of earth

6. Extinctions 5 mass extinctions 6th one happening now Loss of diversity
Why?
Loss of diversity
Adaptive radiation

7. Early Life
3.5 BYA
Simple monomers
Polymers
Protocells
RNA then DNA

8. Origin of Eukaryotes
Endosymbiosis