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