1. Evolution
What’s missing??

2. How did life evolve?
Were the first life forms heterotrophic or autotrophic?
How could cellular form take place?

3. NH2 CH4 H20 H2 VOLCANOES RELEASE GASES INTO THE ATMOSPHERE
UV RADIATION
LIGHTNING
NH2 CH4 H20 H2
HETEROTROPHIC PROKARYOTES IN ANAEROBIC ENVIRONMENT
CELL PRECURSORS-PROTOBIONTS FORM
FORMATION OF SIMPLE ORGANIC MOLECULES-amino acids, fatty acids…

4. Autotrophic prokaryotes appear = photosynthesis
O2 and ozone layer appear
Build up of CO2 from anaerobic respiration
Natural selection
Symbiotic relationships of prokaryotes leads to creation of eukaryotes = endosymbiont theory
La, la, la, la life goes on…

5. ENDOSYMBIOTIC THEORY