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Ordovician .
Carboniferous Silurian Ordovician Devonian Cambrian Pre Cambrian
Precambrian is BEFORE the Cambrian period!
Yes, the Cambrian Period was before the Mesozoic Era
Fish first appeared in the Cambrian period, long before the Devonian.
The only plant from the Cambrian period is algae.
The Ediacarian fauna are from the Cambrian Explosion. The Cambrian Explosion occurred in the Cambrian period. The Cambrian period was part of the Paleozoic era.
There was no language used in the Cambrian period. Humans had not yet evolved.
Haikouichthys and Myllokunmingia were two vertebrates in the Cambrian Period
The group of animalia (animals) did not fully form until the Cambrian period. There is evidence of simple life (single-celled) and small multi-celled life forms from before the Cambrian explosion.
The Cambrian Period
I assume you are referring to the Cambrian Explosion... It was a period on Earth many millions of years ago after heavy bombardment from asteroids. A huge "explosion" of species and life came to form on Earth.