1. Formation approximately 4.5 bya
Early Earth
Formation approximately 4.5 bya

2. Describe the Early Earth

3. Abiogenesis Living things come from nonliving things
Up until the 19th century, (aka: spontaneous generation)
Widely accepted
explanation for the origins of many organisms, especially ones considered vermin.

4. Abiogenesis Revisited
Could early cells have formed from nonliving matter?

5. Repeated Experiments
The results still showed that organic molecules can form under early Earth’s conditions.

6. Life History Protobions Prokaryote (Bacteria)
Cyanobacteria (Photosynthetic)**
Eukaryote (unicellular)
Endosymbiotic theory
Unicellular to Multicellular
Colonial Flagellate Hypothesis
Plants
Animals (water to land)

9. What do fossils tell us?
1. help scientists determine the age of the earth
Biodiversity

10. LAW OF SUPERPOSITION
the oldest layer is on the bottom and the youngest is on top- fossils are older in the lower layers

11. Extinctions can be seen in rock layers
What conclusion can we draw about extinctions since the beginning of time?

12. What’s the biggest cause of extinctions today?

13. What do fossils tell us?
3. provide evidence about past events (asteroids, volcanoes, ice ages)
Biodiversity
What conclusion can be made about the earths climate since the beginning of time?

14. What do fossils tell us? 2. give clues about organisms
that lived long ago,
relationships and how
they have changed over time
Tree of Life
Biodiversity