Eras is already plural.
The singular is era.
eras
Eras was created in 1976.
There are 4 eras, and they are the Hadean, Archean, Proterozoic, and Phanerozoic eras.
That's not a phrase, but if you want a translation of it, it's eram eras sumus. That's if the "you" in "You were" is singular. If the "you" is plural, then it's eram eratis sumus.
Periods are subdivisions of geological eras.
Eras are divided into periods.
Four eras. that is Cenozoic,mesozoic,paleozoic and precambrian
Willy Eras was born on 1980-09-10.
Geological eras can be divided into periods, epochs and ages.
Geological eras can be divided into periods, epochs and ages.
This question needs to be more specific. Life in different eras was different...but perhaps provide specific eras for a better result.
Most scientists agree that there are 3 eras for every eon.