a long time
Its Archeozoic.
yes but they were mostly destroyed
Archeozoic and ProterozoicThe two periods of the Cenozoic Era are the Tertiary and the Quatemary.
the Mughal era was 331 years long
100 Years,. Correction: Asking how long an era is, is the same as asking how long is a piece of string. An era can be any segment of time that can be distinguished. Such as, the 'Nazi era', 'George W. Bush era'. An era is NOT 100 years, that is a century.
a long time ago :]
An era is "A long and distinct period of history with a particular feature or characteristic."
an era is a very long span of geologic time
The Reconstruction era ran from 1865 to 1877. Though in the long run, it really didn't work out.
An era is just a general period of time marked by distinctive events. A decade is 10 years long.
from 1837 to 1901.
An era is "A long and distinct period of history with a particular feature or characteristic."