<Table> <Tr> <Th> Date </Th> <Th> Gya </Th> <Th> Event </Th> </Tr> <Tr> <Td> 14 Sep </Td> <Td> 4.1 </Td> <Td> `` Remains of biotic life '' found in 4.1 billion - year - old rocks in Western Australia . </Td> </Tr> <Tr> <Td> 21 Sep </Td> <Td> 3.8 </Td> <Td> First Life ( Prokaryotes ) </Td> </Tr> <Tr> <Td> 30 Sep </Td> <Td> 3.4 </Td> <Td> Photosynthesis </Td> </Tr> <Tr> <Td> 29 Oct </Td> <Td> 2.4 </Td> <Td> Oxygenation of Atmosphere </Td> </Tr> <Tr> <Td> 9 Nov </Td> <Td> </Td> <Td> Complex Cells ( Eukaryotes ) </Td> </Tr> <Tr> <Td> 5 Dec </Td> <Td> 0.8 </Td> <Td> First Multicellular Life </Td> </Tr> <Tr> <Td> 7 Dec </Td> <Td> 0.67 </Td> <Td> Simple Animals </Td> </Tr> <Tr> <Td> 14 Dec </Td> <Td> 0.55 </Td> <Td> Arthropods ( ancestors of insects , arachnids ) </Td> </Tr> <Tr> <Td> 17 Dec </Td> <Td> 0.5 </Td> <Td> Fish and Proto - amphibians </Td> </Tr> <Tr> <Td> 20 Dec </Td> <Td> 0.45 </Td> <Td> Land Plants </Td> </Tr> <Tr> <Td> 21 Dec </Td> <Td> 0.4 </Td> <Td> Insects and Seeds </Td> </Tr> <Tr> <Td> 22 Dec </Td> <Td> 0.36 </Td> <Td> Amphibians </Td> </Tr> <Tr> <Td> 23 Dec </Td> <Td> 0.3 </Td> <Td> Reptiles </Td> </Tr> <Tr> <Td> 24 Dec </Td> <Td> 0.25 </Td> <Td> Permian - Triassic Extinction Event , 90 % of Species Die Out </Td> </Tr> <Tr> <Td> 25 Dec </Td> <Td> 0.23 </Td> <Td> Dinosaurs </Td> </Tr> <Tr> <Td> 26 Dec </Td> <Td> 0.2 </Td> <Td> Mammals </Td> </Tr> <Tr> <Td> 27 Dec </Td> <Td> 0.15 </Td> <Td> Birds </Td> </Tr> <Tr> <Td> 28 Dec </Td> <Td> 0.13 </Td> <Td> Flowers </Td> </Tr> <Tr> <Td> 30 Dec , 06 : 24 </Td> <Td> 0.065 </Td> <Td> Cretaceous -- Paleogene extinction event , Non-avian Dinosaurs Die Out </Td> </Tr> </Table>
<Table> <Tr> <Th> Date </Th> <Th> Gya </Th> <Th> Event </Th> </Tr> <Tr> <Td> 14 Sep </Td> <Td> 4.1 </Td> <Td> `` Remains of biotic life '' found in 4.1 billion - year - old rocks in Western Australia . </Td> </Tr> <Tr> <Td> 21 Sep </Td> <Td> 3.8 </Td> <Td> First Life ( Prokaryotes ) </Td> </Tr> <Tr> <Td> 30 Sep </Td> <Td> 3.4 </Td> <Td> Photosynthesis </Td> </Tr> <Tr> <Td> 29 Oct </Td> <Td> 2.4 </Td> <Td> Oxygenation of Atmosphere </Td> </Tr> <Tr> <Td> 9 Nov </Td> <Td> </Td> <Td> Complex Cells ( Eukaryotes ) </Td> </Tr> <Tr> <Td> 5 Dec </Td> <Td> 0.8 </Td> <Td> First Multicellular Life </Td> </Tr> <Tr> <Td> 7 Dec </Td> <Td> 0.67 </Td> <Td> Simple Animals </Td> </Tr> <Tr> <Td> 14 Dec </Td> <Td> 0.55 </Td> <Td> Arthropods ( ancestors of insects , arachnids ) </Td> </Tr> <Tr> <Td> 17 Dec </Td> <Td> 0.5 </Td> <Td> Fish and Proto - amphibians </Td> </Tr> <Tr> <Td> 20 Dec </Td> <Td> 0.45 </Td> <Td> Land Plants </Td> </Tr> <Tr> <Td> 21 Dec </Td> <Td> 0.4 </Td> <Td> Insects and Seeds </Td> </Tr> <Tr> <Td> 22 Dec </Td> <Td> 0.36 </Td> <Td> Amphibians </Td> </Tr> <Tr> <Td> 23 Dec </Td> <Td> 0.3 </Td> <Td> Reptiles </Td> </Tr> <Tr> <Td> 24 Dec </Td> <Td> 0.25 </Td> <Td> Permian - Triassic Extinction Event , 90 % of Species Die Out </Td> </Tr> <Tr> <Td> 25 Dec </Td> <Td> 0.23 </Td> <Td> Dinosaurs </Td> </Tr> <Tr> <Td> 26 Dec </Td> <Td> 0.2 </Td> <Td> Mammals </Td> </Tr> <Tr> <Td> 27 Dec </Td> <Td> 0.15 </Td> <Td> Birds </Td> </Tr> <Tr> <Td> 28 Dec </Td> <Td> 0.13 </Td> <Td> Flowers </Td> </Tr> <Tr> <Td> 30 Dec , 06 : 24 </Td> <Td> 0.065 </Td> <Td> Cretaceous -- Paleogene extinction event , Non-avian Dinosaurs Die Out </Td> </Tr> </Table>
if we compress the entire history of the universe into one year life on earth appeared
if we compress the entire history of the universe into one year life on earth appeared
21 Sep
21 Sep