Respuesta :
Eras and then smaller periods based on geologic and biologic events that occurred during those times. According to geological time scale, there are six eras from the beginning some periods of few eras & then period is classified into smaller units called "epoch"
In short, Your Answer would be Option B
Hope this helps!
In short, Your Answer would be Option B
Hope this helps!
The answer is B) eras and then smaller periods based on geologic and biologic events that occurred during those times. I took this test :)