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

get well flower