Eons are the broadest category of geologic time, and we live in the phanerozoic eon. the phanerozoic eon is further divided into eras. what divides the three eras of the phanerozoic eon?

The eons are defined as the longest portion of the geological time scale, which records all the major distinct events that have taken place in the past. It's unit time is a billion years.

This eon is divided into 3 eras, namely-

(1) Paleozoic Era

(2) Mesozoic Era

(3) Cenozoic era

These eras are distinctly divided on the basis of the first appearance and disappearance of life forms on earth, which has been studied and determined through the study of the fossil assemblages that have been obtained. In addition to this, they are also classified based on the climatic variation that has favored the growth and expansion of different life forms that have occurred on earth in the geological past.

it would be heredity

the endomembrane system i think