bio By nicksnyder004 1 CE Humans appear .1MYA 2 Jesus' Birth .002MYA 2 USA's Declaration of Independence .0002MYA 37 Primitive horses appear 37MYA 38 Anthropoids appear (day---active primates) appear 38MYA 60 Primates Appear 60MYA 66 Cenozoic Era 66MYA-Present present to 66MYA 66 Great Extinction, dinosaurs disappear 66MYA 114 Primitive birds appear 114MYA 208 Great Extinction, mammals and dinosaurs appear 208MYA 245 Mesozoic Era 6MYA-245MYA 245 Great Extinction, seeds appear 245MYA 286 Reptiles appear 286MYA 360 Great Extinction, amphibians appear 360MYA 408 Land plants appear 408MYA 438 Great Extinction, fish appear 438MYA 505 Marine invertebrates appear 505MYA 550 Paleozoic Era 245MYA-550MYA 550 Cambrian Explosion 550MYA huge diversity in a short amount of time 650 Sexual Reproduction Begins 650MYA 650 Multicellular life appears 650MYA 1750 First Eukaryotes appear 1750MYA 2200 First great extinction, oxygen producting bacteria "poison" the enviornment, age of aerobic organisms begin 2200 MYA 2500 First photosynthesis/autotrophic bacteria appear 2500MYA 3650 Precambrian Era 550MYA-3650MYA 3650 Earliest evidence of life 3650MYA Heterotrophic, prokaryotic, bacteria