Answer:

The history of HUMANS is closely related to the history of the earth.

The earth contains geological, archaeological and biological records of historical times in its upper layers.

They are important for reconstructing the history of the earth and various living organisms.

The fossil bones of the human ANCESTORS are embedded in the earth’s layers.

Palaeoanthropologists and archaeologists excavate the soil and rock layers on the earth and EXTRACT evidence about human ancestors.

These layers and the fossils are scientifically dated to study the various stages in human evolution and prehistory.

Through the GATHERED evidence they attempt to understand the evolution of human history and developments in a chronological order.

The earth was formed approximately 4.54 billion years ago.

Gradually conditions emerged for the growth of organisms. Then plants and animals came into being and thereby foundation was laid for the evolution of humans. The long SPAN of time in earth’s history is divided into eras, periods and epochs by the Geologists.

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