List the four eras on the geologic time scale describe one identifying type of organism from each era

The four main time scales, starting from the earliest, are:
Precambrian- This era consisted of single-celled organisms and multicellular organisms also began to arise in this time period.
Paleozoic- The early part of this era primarily had fish and the latter part of the era consisted of amphibians and reptiles.
Mesozoic- The mesozoic era had dinosaurs, birds and some flowering plants
Cenozoic- Many dinosaur species had gone extinct and this era contains mammals.

The organism dies boomshakalaka

Carbon-14 has a half-life of 5,730 years and most igneous rock is older than that.