origin of life

evidence for oxygen

banded iron formations in rocks 3.5 to 1.8 bya, pyrite conglomerates 2.8 to 2.0 bya

evidence for photosynthesis

isotopically ‘light‘ carbon (more carbon 12 than would be expected in abiotic situation) - 3.8 bya

miller urey experiment what did apparatus simulate?

appratus simulated early earth conditions: water, simple nonorganic chemicals, electric discharge to represent lightning

miller urey experiment

primoridal soup in apparatus and electric charges were taking place when running it

simple molecules

C, H2, H2O, NH3, CH4

stromatalites

prokaryotic

for cell to work it has to

have replication and pass on genetic information; has to have boundary between itself and outside environment; function and survive

miller experiment did not

did not create life but were able to synthesize components of life