Even simple cyanobacteria perform extremely complicated processes (photosynthesis, stromatolite formation, reproduction, etc) that most probably evolved from a simpler ancestor

Scientists reasoned that Earths early atmosphere consisted of hydrogen, ammonia, methane, etc(from outgassing)With enough energy these molecules may react to form a primordial soup

Conducted in 1952Simulated conditions of the ArcheanReactants: water, methane, ammonia, carbon monoxide and hydrogen gasElectrodes used to simulate lightning (energy source)Products: Amino acids and sugars (but no DNA)

Organic molecules were delivered to Earth from another place in spaceHydrothermal vents may have provided the conditions needed for life to develop (RE: extremophiles)

Something to keep in mindLife may have started and restarted many times

Before the development of DNA>RNA>Protein, life may have relied exclusively on RNARNA is able to store genetic information (like DNA) and catalyze reactions (like proteins)

Fossil evidence suggests earth was dominated by unicellular organisms called PROKARYOTES. One cellNo nucleus (DNA/RNA storage)Organisms that have organelles are called EUKARYOTES

A mass extinction event 750 mya caused the extinction of many of these unicellular eukaryotesEvidence from glacial deposits suggest ice may have advanced all the way to the equatorNot everything died off

After the ice retreated (630 mya), the climate warmed dramatically and the first multicellular organisms appeared. In 1947, fossils dated to this time period were found in Australia's Ediacaran Hills (EDIACARAN BIOTA)Impressions of large, soft bodied eukaryotes

Answered why no fossils of ancestral complex life existed during the CambrianThought to be representative of early jelly fish and other aquatic creatures but

Preservation BiasThe sudden vanishing of Ediacaran fossils at the Cambrian boundary could simply be because conditions no longer favoured the fossilisation of Ediacaran organisms, which may have continued to thrive unpreserved.Some scientists suggest that this collection of fossils may not represent a relative, but rather another unique branch of the tree of life.No mouth, anus, or gut

Make a comic depicting the three hypotheses on how life may have begun.You may use bit strips (youll need me to authorize you as a JFSS student)Traditional pencil / paperPREZISomething else?P. 637 Q: 3, 4, 5, 6