Eras are divisions in geologic time divided into periods and epochs. any time periods in the past. divisions of time based on cultural standards, as in "stone age." the time frames during which a certain fossil species existed.

Choose the sentence in which the capitalized word is grammatically correct.  a.  africa no están tan grande como eurasia.      b.  el río más grande del mundo son en sudamérica.      c.  el príncipe estoy de sudamérica.      d.  era amigo de la princesa de india