The earth was formed 4.6 billion years ago from a solar nebula ( a ball of gas and dust in outer space.)
After the earth cooled down about .6 billion years later water were able to condence and rain water to make what is now oceans
The oldest rock was discovered in greenland and was 3.8 billion years old.
The first prokaryotic cell or (simple cell) was discovered 3.5 billion and it was a simple cell because it lacked a nucleus.
![Picture](/uploads/2/5/8/7/25870187/7862135.jpg)
The first eukaryotic cell or(complex cell) was recorded 2 billion years ago were complex cells because they had a nucleus.
![Picture](/uploads/2/5/8/7/25870187/4675686.jpg)
The jellyfish like animal was a multicelluar animal that was first recorded was 600 million years ago.
ex jelly fish,sea sponge, and very simple multiple eukaryotic cells.
ex jelly fish,sea sponge, and very simple multiple eukaryotic cells.
![Picture](/uploads/2/5/8/7/25870187/1055064.gif)
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an invertebrate with an exoskeleton,segmental body jointed appendages.
an invertebrate with an exoskeleton,segmental body jointed appendages.
![Picture](/uploads/2/5/8/7/25870187/9790225.jpg)
80 to 90 percent of all specs went extinct during this mass extinction and that ended the precambrian era.