there are two eras BC -before christ and AD- anno domino (after his death)
Most scientists agree that there are 3 eras for every eon.
None
The Precambrian Eon consists of three main eras: the Hadean, Archean, and Proterozoic eras.
there are three, but we live in one of them :)
The geologic time scale is divided into four eras: the Precambrian, Paleozoic, Mesozoic, and Cenozoic eras. Each era represents a distinct span of time in Earth's history with characteristic geological and biological features.
Four. Precambrian, Paleozoic, Mesozoic, Cenozoic.
Eras was created in 1976.
a lot
There have been many design eras over the past 100 years. The most influential design eras of this time include Cubism, Dadaism, Expressionism, Abstract Expressionism, Fauvism, Futurism, PopArt, and Surrealism.
Eras is already plural. The singular is era.
Eons are divided into eras, which are further divided into periods. Each period is then subdivided into epochs.