Who is bored and can help me with this timeline?

i missed school because i was out sick :( i need help on this paper though we learned a lot about the food web andfood chains but i missed out. can you help me put this in order?





starting from 5 billion years ago...to today





which on goes first?





earth formed


first birds


first monkeys


first land plants


atmosphere and oceans


first bacteria first dinosaurs


first primates


first soft-bodied animals (jellyfish)


first animals with a backbone


first amphibians


first animals with hard shell


first organisms with many cells (multicellular algae)


first cell with a nucleus (eukaryotes)


first reptiles


first land animals (insects)


first flowering plants


mass extinction of many oragnisms including dinosaurs


oxygen begins to build up in the atmosphere








thanks :)

Who is bored and can help me with this timeline?
Key: BYA = billions of years ago


MYA = millions of years ago





earth formed ~ 4.6 BYA


1st birds ~ 213 MYA


1st monkeys aka mammals ~213 MYA


1st land plants ~438 MYA


atmosphere %26amp; oceans form ~4.2 BYA


1st bacteria ~3.8-2.5 BYA (cyanobacteria oldest ~3.5 BYA)


1st dinosaurs ~248 MYA


1st primates (see monkeys above)


1st soft-bodied animals (not sure but maybe ~505 MYA when invertebrates were dominant)


1st backboned animals - no idea but guessing ~590 MYA


1st amphibians ~408 MYA


1st hard shells - I think ~ 540-250 MYA


1st multicelluar organisms - The Ediacara Fauna~ 700-540 MYA


1st eukaryotes ~1.8 BYA


1st reptiles ~320 MYA


1st insects ~ (same as terrestrial plants) ~439-408 MYA


1st flowering plants ~144 MYA


O2 starts building in the atmosphere ~ 3.5 BYA because oxygen was a waste product of photosynthetic organisms like cyanobacteria





There were many mass extinctions:


--- "Cambrian Explosion" in the Cambrian period (540-250 MYA)


--- mass extinction at the end of the Ordivician period (495-439 MYA) where 75% of all animals went extinct


--- Devonian period (439-408 MYA) when 75% of all marine life went extinct


--- Permian period (290-250 MYA) when 96% of all species went extinct due to volcanic eruptions and a meteor strike


--- And the most popular extinction at the end of the Cretaceous period (144-65 MYA), caused by a meteor





PHEW!





I just had to memorize all this stuff a few weeks ago so I still have all the notes. I understand your pain.
Reply:earth formed then oxygen begins to build up in the atmosphere


P.S im totally guessing but it makes sense to me since no life can exist without oxygen