Era is a scientific term that is used to describe a specific period with distinctive character, events, etc. The age of our home planet Earth is also divided into the four Ears :
1. Precambrian Era – In this era the Earth’s atmosphere gained oxygen and single cell organism were developed.
2. Paleozoic Era – Various fishes were developed in the seas, many trees and amphibians also appeared in this Era.
3. Mesozoic Era – This Era includes the period of the dinosaurs.
4. Cenozoic Era – In this Era, the most forms of life we can see today first came into existence.