Solar ago This was a time of volcanic eruptions

Solar system formed about 4.

6billion years  ago. Condensed clouds of rock and dustsurrounding the sun This experiment was conductedaround 60 years ago.Stanley Miller and Harold Ureytested the Oparin-Haldane hypothesis by creating laboratory conditionscomparable to conditions they thought existed on early Earth.These types of experiments showthat abiotic synthesis of organic molecules is possible Single celled organisms could havepossibly been around for 3.9 billion yearsThe earliest evidence of lifedates back 3.5  million years ago fromfossilized stromatolitesThe first single-celled organismsthat we have found are prokaryotes.Stromatolites form whenprokaryotes bind films of sediment together  This occurred around 2.8 billionyears agoAfter this organisms started toexist and live The oldest accepted fossil ofeukaryotic organisms are about 2.1 billion years agoEukaryotes are much more complexthan prokaryotics The earliest multicellulareukaryotes lived around 1.5 billion years agoThe oldest known fossil ofmulticellular is algae around 1.2 billion years old This event happened around 530million years agoThis was  when many phyla of living animals appear outof no where in fossils formed The colonization of land happenedabout 500million years agoThis was when larger forms of lifesuch as fungi, plants, and animals started to move up on and colonize land Pangea was a supercontinent around250 million years agoMost of the land masses around atthe time were connected Around 135 million years ago panesplit into northern and Southern land massesLaurasia was the Northern landmass Around 135 million years ago panesplit into northern and Southern land massesGondwana was the southern landmass This occurred around 250 millionyears agoThis was a time of volcaniceruptions in what is now SiberiaThis led to reduced temperatures This also cause an oxygen deficitwhich could have been the cause of most extinctions This occurred around 65.5 millionyears agoThis eliminated half of all of themarine species and many terrestrial plants and animals including the dinosaurs This occurred around 225 millionyears agoWiped out 76% of marine andterrestrial speciesAllowed dinosaurs to becomedominant on land This occurred about 400 millionyears agoCan not be tied to a single eventbut could be global temperature change, meteorites, and/or nutrient runoffLowest in severity of the 5 majorextinctions This occurred around 445 millionyears agoEliminated 85% off all species inthis time periodDuring this time there was rapidcooling and reduced sea levels due to glaciation Humans appeared around  1.5 million years agoThis was during the Neogene eraand the Pleistocene period This occurs around 330 millionyears agoBut this didn’t happen until theEarth was at the right temperature for the plants to survive and reproduce 

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