BIOL240 Lecture 3: BIOL 240 - Class 3 Fall 2017
Document Summary
Last universal common ancestor is the base of the evolutionary tree. Organisms like these used gases like ch4, co, h2, hcn emitted from the hydrothermal vents: after luca came cyano bacteria. They used light and the method of splitting water to get electrons which they used for energy. The by product was oxygen which was toxic to other non-evolved organisms. Because of the abundance of water and light, Multicellular fossils dating to about 0. 5 billion ybp have been found meaning microbes dominated cyano bacteria thrived and oxygen level rose the planet for approx. Microbial fossil records found called fossilzed mats. Early earth had lots of lighting and electrical discharges which is theorized to have got life going". This is the experiment to show early earth. To this the early gases (methane, co etc) were added and after some time a black sludge was formed.