Which of the following eras occurred first

Can i see the choices, im not sure how to answerp

Explanation:

Hi there!!!

you may be talking about the eras of history of the earth. If so, look down,

The Eras are,

palezoic era: it was the first era where development of first cells and some reptiles took place.Mesozoic Era :it is the secondmost where the reptiles were dominant.Cenozoic Era: This era includes all the multicellular organism including human fisrt development up to now in modern age.

so, palezoic era was first occured era.

Hope it helps..